JoNes, Ohief Judge,
delivered the opinion of the court:
Plaintiff Grace Line Inc. is a Delaware corporation, operating passenger, cargo and mail vessels of American registry on trade routes between Atlantic coast ports of the United States and Pacific coast ports in South America, including those of Peru. Plaintiff’s vessels are utilized by the United States Post Office Department for the maritime conveyance of mail destined for areas in South America encompassed within plaintiff’s trade routes, and have been so utilized since prior to July 1, 1937.
In its petition herein, plaintiff asserts a claim, in counts I and II, for monies allegedly due and owing to it by the [485] United States for the outbound maritime carriage of Peruvian mail between July 1,1937, and February 29,1956, and, in count III, to recover payment for the maritime carriage of mail which is alleged to have been unlawfully diverted by the United States from plaintiff’s vessels to vessels of foreign registry between February of 1953 and February of 1956. The defendant paid the entire amount claimed under count I, and later recouped this amount, alleging it had been previously paid to plaintiff by mistake.
COUNT I
In accordance with the authority conferred upon him by Title 5, § 372, of the United States Code, the Postmaster General of the United States in 1921 negotiated and concluded with the governments of numerous Central and South American countries, including that of Peru, certain postal conventions known as the Pan American Postal Union. Commencing with the Second Congress of the Pan American Postal Union (which then became known as the Postal Union of the Americas and Spain) held in Mexico in 1926, the United States was a party to postal conventions which adopted the principle of “free and gratuitous transit” of mail between the nations signatory to the conventions. The United States took definitive action to effectuate this principle at least as early as July 1, 1937, and continued to do so until March 1, 1956.
Based upon the concept that the countries comprising the Union constitute a single postal territory and that the postal facilities of any one of them should be at the disposal of all, the “free and gratuitous transit” principle imposed an obligation upon each member nation to transport across its territory and to convey, by the same vessels of its flag which it utilized for the maritime carriage of its own mail, all outbound mail of the other members free of any charge whatsoever for this service. A vessel of the flag of any signatory nation performing this service of transporting mail by sea on behalf of any other signatory nation was therefore required to look to the country of its flag for compensation in consideration of the rendition of this service. The Madrid [486] Convention, 1931, of the Postal Union of the Americas and Spain, 47 Stat. 1924,1925, which, was in effect on July 1,1937, provided:
Article 3
Free and Gratuitous Transit
1. The gratuity of territorial, fluvial and maritime transit is absolute in the territory of the Postal Union of the Americas and Spain; consequently, the countries which form it obligate themselves to transport across their territories and to convey by the ships of their registry or flag which they utilize for the transportation of their own correspondence, without any charge whatsoever to the contracting countries, all that which the latter may send to any destination.;
2. In cases of reforwarding, the contracting countries are bound to reforward the correspondence by the ways and means which they utilize for their own dispatches.
On July 1,1937, orders were promulgated and rates established by the Postmaster General for the carriage of “Convention mail,” that is, mail the United States was obligated to transport by vessels of its flag free of charge under the “free and gratuitous transit” provisions of the Postal Union of the Americas and Spain. From that date, until World War II interrupted its service, and from the resumption of its service in 1946, plaintiff carried all of the mail tendered to it by the United States Post Office Department on the southbound portion of the voyages of its vessels. On the return, or northbound, portion of these voyages, plaintiff’s vessels carried the mail tendered to it by the postal administrations of other signatory nations, including that of Peru, at their respective ports.
Payments were made to plaintiff by the Post Office Department in accordance with the latter’s orders and rates dealing with the carriage of “Convention mail.” From July 1, 1937, to September 3, 1954, plaintiff was paid a total amount of $460,763.69 by the Post Office Department for the carriage of Peruvian “Convention mail,” and at no time during this period did the Post Office Department indicate to plaintiff that no compensation would be paid for this particular service. In faot, the Post Office Department sent [487] an inquiry to the Peruvian Post Office Department in 1937 to determine whether or not any vessels of United States registry were required to convey Peruvian mail free of charge by reason of port privileges or other concessions granted them, stating that the Department would not pay compensation for any service performed by such a vessel. Although the reply by the Peruvian officials to this inquiry, if any was received at all, is not in evidence, it may reasonably be inferred from the fact that the Post Office Department made payments to plaintiff for the carriage of Peruvian “Convention mail” for a period of 17 years thereafter, that a determination of this matter satisfactory to the Post Office Department was made.
It may also be pointed out that, in this same inquiry of 1937, the Post Office Department requested the Peruvian postal authorities to furnish each vessel of United States registry transporting Peruvian “Convention mail” with appropriate documents indicating the amount of such mail carried, its destination, etc. The express purpose of this request was stated to be that the information was necessary to enable the Post Office Department to compensate the American companies performing this service. However, on September 3, 1954, the Post Office Department stopped further payment to plaintiff for the carriage of Peruvian “Convention mail” and began to withhold monies otherwise due to plaintiff for the carriage of other mail. The entire amount paid to plaintiff for the carriage of Peruvian “Convention mail” during the preceding 17 years was thus recouped by the Post Office Department. This action was taken when Law 6207 of Peru, which had been promulgated in 1928, came to the attention of the Post Office Department during the course of inquiries it instituted apparently as a result of this court’s decision in Moore-McCormack Lines, Inc. v. United States, 119 Ct. Cl. 473 (1951). Because of the view that this law of Peru compelled plaintiff to transport outbound Peruvian mail gratuitously, the Post Office Department took the position that the United States was not obligated to pay for this service under the “free and gratuitous transit” provisions of the Union and, further, that the [488] payments made to plaintiff since 1937 had been made in error.
This is the factual pattern giving rise to plaintiff’s contention in count I that it is entitled to recover the amount, $460,763.69, previously paid to it by the United States for the carriage of Peruvian “Convention mail” from July 1, 1937, to September 3, 1954, and then subsequently recouped by defendant. We are met at the outset with defendant’s assertion that Law 6207 of Peru, and Article 6 thereof in particular, did in fact require plaintiff’s vessels to transport Peruvian outbound mail gratuitously, and consequently relieved the United States of any duty with respect to such mail under the “free and gratuitous transit” provisions of the Union.
Law 6207 is entitled an act “Establishing The National Coastwise Service” and Article 6 thereof provides:
Article 6. Both the national and foreign navigation companies are under the obligation to carry Peruvian mail between Peruvian ports, and that [mail] destined for abroad, without any charge for this service.
Defendant points to the clause set out in commas, “, and that [mail] destined for abroad,” as supporting its assertion. However, it is obvious that this clause must be construed in the light of its context. The enactment as a whole appears to have been concerned with the establishment of a coastwise maritime service for the benefit of Peru, this being shown by its title and its other provisions. It is set out in full in finding 19. We are of the opinion that it is a local law, dealing particularly with traffic along the coast of Peru, and was not intended to govern the rendition of maritime services between the ports of Peru and those of other nations. We believe Article 6 to be descriptive of two types of mail which must be carried between ports of Peru by vessels of foreign registry, and its operative effect may be illustrated as follows:
A vessel of United States registry traveling from Mol-iendo, Peru, to Callao, Peru, and thence to New York, would be required to transport all Peruvian mail from Moliendo and destined for Callao for distribution in that area free [489] of charge under Article 6. Similarly, a vessel making such a voyage would also be obligated under Article 6 to transport Peruvian mail from Moliendo and destined for New York for distribution there free of charge for that fart of its voyage lying between Moliendo and Callao only; i.e., for that part of the voyage along the Peruvian coast.
Thus, Article 6 would have no bearing upon maritime services performed beyond the coastline of Peru, nor would this be necessary to effectuate the purpose of the enactment to insure that protection needed to encourage the development of a national coastwise maritime service for the benefit of Peru.
The record also indicates that this was the construction of Article 6 actually put into effect by the Peruvian authorities themselves. It may be noted that, although parcel post was not entitled to free transit under the “free and gratuitous transit” provisions of the Union, since it is not “correspondence,” parcel post is, nevertheless, “mail.” Therefore, if the construction of Article 6 urged upon us 'by defendant is correct, we would expect that the Peruvian postal officials would also require plaintiff to transport this class of mail beyond the coastline of Peru free of charge. Yet the record is clear that plaintiff’s vessels have carried parcel post matter outbound from Peru at least since 1937 and that plaintiff has always been paid, and is still being paid, by the Peruvian Postal Administration for the rendition of this service.1 Again, there is in evidence an opinion of the Fiscal (Attorney General) of Peru dated February 3, 1960, authorizing payment by Peru to plaintiff for the carriage of Peruvian mail after the United States had withdrawn from the “free and gratuitous transit” provisions of the Union. This fact of payment hardly comports with defendant’s conception of the meaning of Article 6.
In view of these considerations, we are of the opinion, and so hold, that Law 6207 of Peru did not require plaintiff’s vessels to carry Peruvian mail beyond the coastline of Peru gratuitously.
[490] Defendant also relies upon a Supreme Resolution of Peru of 1927, a document which was not introduced in evidence, as showing that plaintiff was obligated to convey the Peruvian mail here in issue free of charge in consideration of certain concessions which had been granted to it by the Peruvian government. Aside from the fact that this document is not in evidence, we are of the opinion that it is in-apposite in view of the trial commissioner’s finding' — -which we have adopted — that it was rendered obsolete by subsequent Supreme Resolutions, all promulgated prior to 1987, which imposed no such obligation on plaintiff.2
Since we have decided that plaintiff was not obligated under Peruvian law, or by virtue of concessions granted it by the Peruvian government, to transport the Peruvian mail here in issue beyond the coastline of Peru free of charge, we must next consider defendant’s assertion that, in any event, plaintiff is not entitled to the amount sought in count I. It is defendant’s theory that, since the Congress enacted no legislation providing compensation for American flag vessels transporting “Convention mail” and there was no express agreement between these parties providing for such compensation, plaintiff must of necessity be attempting to enforce directly the provisions of the various Conventions of the Postal Union of the Americas and Spain in this court. Defendant therefore strongly urges upon us the fact of plaintiff’s lack of standing to enforce the provisions of a postal convention and this court’s lack of jurisdiction to determine claims based upon treaties with foreign nations.
Interesting though these questions might be, it is not necessary that we consider them now, for it is apparent that plaintiff’s claim in count I is founded upon a contract, implied-in-fact. The facts found by the trial commissioner make clear that plaintiff did not intend to render these maritime services in behalf of the United States gratuitously, nor did the United States have any reason to suspect that they were being rendered gratuitously. On the contrary, the Postmaster General issued orders and rates in 1937 with respect to the payment for the transportation of “Convention mail” by ships of United States registry and did in fact pay [491] plaintiff for the very services here in issue for a period of 17 years.
Moreover, the Beports of the Postmaster General for 1955 and 1956', in discussing the reason for the withdrawal of the United States from the “free and gratuitous transit” provisions of the Union in 1956, clearly recognize the responsibility of the United States to pay its own steamship companies for the maritime services they performed for the other members of the Union.3 In this connection, we quote from the Beport of 1955 as follows:
This provision [“free and gratuitous transit”] now requires that each country furnish its postal transportation facilities and maritime shipping services free of charge to other member countries. As a consequence, the United States is required to pay its own steamship companies for the service they perform for the other member countries. And as the United States has by far the greater number of ships, this results in disproportionate use of our facilities and the expenditure of approximately $1,200,000 annually. The Department plans to terminate this arrangement in fiscal 1956.
Thus, as late as 1955, the Department still recognized its obligation to compensate plaintiff. It sought to modify the provision because it had so many more ships in the service than the other signatories that it felt it was carrying more than its fair share of the load. The Department’s Beport of 1956 indicates that it followed through on this proposal by formulating a reservation to the “free and gratuitous transit” provisions, thus relieving the United States “of the responsibility for paying our steamship companies for transporting the mail of other PUAS countries and requires member countries to pay the Department for transporting their transit mail across United States territory.”
When the provisions of the Union, the orders of the Postmaster General and the Beports are considered as a whole, it becomes clear that both parties expected that payment would be made to plaintiff for the services involved. Payment was made for 17 years. It is now too late for plaintiff to collect from Peru, even if the legal status of this claim [492] were such, as to permit such a recovery. Plaintiff would thus be left without a remedy.
This conduct on the part of both parties, for this period of time, leaves no doubt that each of them manifested, in deeds if not in words, that assent essential to the establishment of a judicially enforceable promise to pay. Tidewater Coal Exchange, Inc. v. United States, 67 Ct. Cl. 590 (1929); Restatement, Contracts, §21 (1932). Therefore, since the United States has failed to fulfill its promise to plaintiff in this respect, it is our conclusion that plaintiff is entitled to recover the amount sought in count I of its petition.
COUNT rr
Effective March 1, 1956, the United States formulated a reservation to the “free and gratuitous transit” provisions of the Postal Union of the Americas and Spain, thereby terminating its obligation to provide for the transportation of “Convention mail” free of charge by vessels of its flag on behalf of the other members. As we have seen, the Post Office Department had, on September 3,1954, notified plaintiff that the United States would no longer pay compensation to it for the carriage of Peruvian “Convention mail” and had also commenced to withhold other monies otherwise due plaintiff in order to recoup the amount paid for this service during the preceding 17 years.
Nevertheless, plaintiff continued to transport this class of Peruvian mail between September 3,1954, and February 29, 1956, although the United States never made payment, or promised to pay, for these services. This is the basis for plaintiff’s claim in count II of its petition, in the amount of $47,411.83. It is contended that the United States is obligated to compensate plaintiff for these services for the same reason that it is obligated to compensate plaintiff for the services rendered between July 1, 1937, and September 3, 1954.
We do not agree. We have found that the conduct of the United States during the period of time involved in count I was such as to manifest its promise to pay for the maritime services rendered on its behalf by plaintiff. However, a totally different situation obtains in regard to the relation be[493] tween these parties after September 3, 1954. The action of the Post Office Department on that date, when it stopped further payment for the services and began recouping the amount previously paid, must be taken as unequivocal notice to plaintiff that the United States no longer agreed to pay for the maritime seiwices here involved. Plaintiff can point to no act on the part of defendant, either by word or by deed, upon which can be founded an express or implied promise to pay. It must be said, therefore, that plaintiff carried Peruvian “Convention mail” subsequent to September 3,1954, at its own risk, and consequently is not entitled to recover under count II of its petition.
count ra
In the third and final count of its petition, plaintiff complains to us that the United States unlawfully diverted United States mail from its vessels to those of foreign registry between February of 1953 and the end of February 1956. Plaintiff’s claim in this respect is founded upon the Merchant Marine Act of 1936, 49 Stat. 1985, which is the current law directing that United States flag vessels be accorded a preference in the carriage of United States mail. Section 405 (a) of that act provides:
All mails of the United States carried on vessels between ports between which it is lawful under the navigation laws for a vessel not documented under the laws of the United States to carry merchandise shall, insofar as practicable, be carried on vessels of United States registry.
From at least 1923, the Post Office Department accorded a 24-hour preference (which was extended to a 48-hour preference at some time prior to 1953) to United States flag vessels for the carriage of United States mail. In February of 1953, however, the Post Office Department withdrew this preference from those American flag vessels competing with vessels of the other members of the Postal Union of the Americas- and Spain, putting all such vessels on a time-of-arrival parity. This action was taken for the express purpose of taking full advantage of the “free and gratuitous [494] transit” provisions of the Union;4 that is to say, by withdrawing the preference in this manner, the Post Office Department was then in a more advantageous position to send United States mail free of charge by utilizing vessels flying the flag of another signatory to the Union. This procedure was followed until the end of February 1956, when, by virtue of the withdrawal of the United States from the “free and gratuitous transit” provisions of the Union, there was no longer any economic advantage to denying vessels of United States registry their customary preference. During this period, 85-90 percent of all outbound United States mail was nevertheless loaded on plaintiff’s vessels for carriage, but it is plaintiff’s position that, since it was ready, willing and able to transport 100 percent of this class of mail during this period, the United States has violated its statutory duty under § 405(a) of the Merchant Marine Act of 1936 to grant plaintiff a 100 percent preference. Plaintiff therefore claims the amount it would have earned for the carriage of the additional 10-15 percent of this mail had the United States complied with its statutory duty.
This is apparently the first time a court of law has been called upon to construe the meaning of §405(a). In this connection, we cannot disregard the plain language of that section, for it directs in unequivocal terms that vessels of United States registry be granted a preference for the carriage of United States mail, but only “insofar as practicable.” This clause would certainly seem to imply that the Congress has reposed a measure of discretion in the postal authorities in effectuating the direction contained in the section. Therefore, we cannot say that, as a matter of law, the executive agency charged with the responsibility of seeing to the proper transportation of United States mail ignored the congressional mandate of § 405(a) by providing for the transportation of such mail free of charge to the American taxpayers. Moreover, even if we assume, as plaintiff would have us do, that § 405(a) imposes an ironclad duty upon the Post Office Department to accord a 100 percent preference to United States vessels at all times, it would not follow that plaintiff itself, as opposed to other companies operating [495] American flag vessels, is entitled to such preference at all times. In other words, and leaving aside the element of discretion implicit in the very language of the section, it is difficult to discern in what manner § 405(a) establishes a judicially enforceable right on behalf of this plaintiff as against the United States. In our opinion, the section does not grant a right to any particular organization operating vessels of United States registry to force the United States to grant it a 100 percent preference in the carriage of United States mail. The section appears to be more in the nature of a congressional declaration of policy to guide the Post Office Department in the discharge of its duties. We conclude, then, that plaintiff has shown no basis upon which the relief sought in count III can be granted.
Plaintiff’s request that interest be awarded on the amount of its recovery under count I is denied. 28 U.S.C. § 2516 (a) (1958).
Plaintiff’s claim for relief under count I of its petition will be granted, and its claims for relief under counts II and III will be denied with the petition as to those counts dismissed. Defendant’s counterclaim will be dismissed. Judgment will be entered to that effect in the amount of $460,763.69.
It is so ordered.
Reed, Justice (Bet.), sitting by designation; Dukfee, Judge; Laeamoee, Judge, and Whitakee, Judge, concur.
FINDINGS OF FACT
The court, having considered the evidence, the briefs and argument of counsel, and the report of Trial Commissioner William E. Day, makes the following findings of fact:
1. The plaintiff is, and during all times material herein was, a corporation organized and existing under the laws of the State of Delaware, having its principal office in New York, New York.
2. Prior to July 1, 1937, and continuously thereafter, except during part of World War II, plaintiff was engaged in the transportation, by vessels registered under the flag of the United States, of passengers, cargo and mail on a trade route between various United States Atlantic ports, par[496] ticularly New York, and ports on the Pacific Coast of South America and Panama, and on a trade route between various United States Atlantic ports, particularly New York, and the Netherlands West Indies, Venezuela, and the north coast of Colombia.
3. At all times involved in this action, the transportation of mail by ships from United States ports to foreign ports was required by law to be performed at rates fixed by the Postmaster General of the United States.
4. For some time subsequent to September 3, 1954, the plaintiff carried United States and foreign transit closed mail in its ships outbound from the United States as to which the defendant refused to pay the sum of $460,763.59 which it admits at pretrial conference is the proper charge for such carriage. What the defendant has done in this connection has been to withhold this amount from plaintiff, because the Post Office officials were of the view that they had erroneously paid that amount for the carnage of mail by the plaintiff’s ships northbound to the United States from the ports of Peru over a period of about 17 years, from July 1, 1937 through September 2, 1954. In addition to withholding the amount referred to above, the defendant, by its counterclaim filed herein, again claims this same amount from the plaintiff.
5. In accordance with Title 5, Sec. 372, of the United States Code, the Postmaster General of the United States negotiated and concluded with the governments of Panama, Colombia, Venezuela, Ecuador, Peru, Bolivia, and Chile, and other governments, postal treaties or conventions known as the Pan American Postal Union, First Congress, Buenos Aires, 1921, and Second Congress, Mexico, 1926, and Postal Union of the Americas and Spain, Third Congress, Madrid, 1931, Fourth Congress, Panama, 1936, Fifth Congress, Rio de Janeiro, 1946, and Sixth Congress, Madrid, 1950. The ports of the foregoing countries are served by plaintiff, except Bolivia which is landlocked and uses the ports of Peru.
6. The amiual report of the Postmaster General for the fiscal year ended June 30, 1921 reads in part as follows:
[497] The Universal Postal Congress convened at Madrid, Spain, on October 1, 1920, and a postal convention was concluded on November 30 following.
The convention provides for maximum and minimum postage rates, the former being new rates of approximately 100 percent increase, and the latter being those of the present, or Eome convention. The gold franc was established as the basis for the rates to be levied and on accounts to be adjusted. A number, of other important changes were made. The convention will become effective on January 1,1922.
Spanish-American Postal Congress
While the sessions of the Madrid Congress were in progress, the delegates thereto from the United States and the Philippines, Spain, and 20 of the Latin-American countries entered into a separate convention (subject to ratification), which provides in the main that the postage rate on letters and post cards from each country to any of the other contracting countries shall be the domestic letter or postcard rate respectively, of the country of origin; and also that each of the contracting countries shall transport freely and gratuitously through its territory and by means of the services maintained by its postal administration or utilized, for the direct dispatch of its own mails the mails received from any of these countries destined to any other..
The second meeting of this congress, to which it is understood all the countries of Pan America had been invited to send delegates, is known as the Pan American Postal Congress, and convened at Buenos Aires on August 25 and adjourned on September 15, 1921, with the signing of a new convention.
The convention provides for a liberal extension of the domestic rates of postage in the Pan American service on letters, post cards and all kinds of printed matter, commercial papers and samples, and for free intermediary transit of mails handled by one contracting country for another. It adopted the American dollar as the monetary standard and provides for the reply coupon service at the reduced postage rates.
The Congress also concluded a parcel-post convention providing for lower and more uniform delivery charges, it being stipulated that the maximum of such charge, not including the regular customs duty, shall be 10 [498] cents, and specifically prohibiting any other charges than those provided therein.
It is believed that the accomplishments of the United States delegates to the Buenos Aires Congress will prove to be greatly advantageous to our commerce and that these conventions will give Pan America postal advantages of special value.
$ H* $ $ $
7. The annual report of the Postmaster General for the fiscal year ended June 30, 1927, reads in part as follows:
PaN AmericaN Postal Union Congress
The Second Congress of the Pan American Postal Union was held at Mexico City from October 15 to November 9, inclusive, 1926, and concluded a principal convention, which provides for the exchange by mail of letters, post cards, prints, commercial papers and samples, a parcel post convention for the exchange of parcel post, and a money order convention, governing the exchange of money orders between the contracting countries. All of these conventions were signed by the delegates of the United States and have since been ratified and made effective.
This international postal organization comprises the following countries: Argentina, Bolivia, Brazil, Colombia, Costa Pica, Cuba, Chile, the Dominican Republic, Ecuador, El Salvador, Spain, the United States, Guatemala, Honduras, Mexico, Panama, Paraguay, Peru, and Uruguay.
Spain is not an American country, and strictly speaking would not be included in the Pan American Postal Union, but the union originated in the concerted efforts of the American countries at the Universal Postal Union Congress of Madrid in 1920 to keep down postage rates, which nearly all the European countries desired to increase as a result of conditions following the World War. Spain joined with the Americas in opposing an increase in rates and as a result was asked to join the new organization, the foundations of which were laid at that time.
The central idea in the union is that the countries composing it form a single postal territory and that the facilities of any one of them are at the disposal of all. This theory is carried to its logical conclusion in the principal convention of Mexico, which provides that the domestic rates of each country shall apply to mail going [499] to all the other countries of the union and that each country shall transport through its territory free of charge mail of any member of the union destined to a third country. Freedom of transit applies even to the sea when ships of a signatory cov/ntry are used