Mr. Justice Stewart
delivered the opinion of the Court.
The petitioner was convicted by a jury in the United States District Court in Massachusetts upon a 75-count indictment for making false claims against the Govern[170]*170ment in violation of 18 U. S. C. § 287. The trial judge, after preliminary sentencing hearings, came to the conclusion that it would be helpful “for the Court to know something more about the defendant than I have seen or heard up to date.” Accordingly, the court entered an order committing the petitioner “to the custody of the Attorney General of the United States under Title 18, United States Code, 4208 (b).” 1 More than three months later, after considering the report which the Bureau of Prisons had submitted in accordance with § 4208 (b), the trial judge, in a proceeding at which the petitioner and his counsel were present, entered an order suspending imposition of sentence and placing the petitioner on probation for two years. Three days later the petitioner filed a notice of appeal.
Upon motion of the Government the appeal was dismissed as untimely, on the ground that the period for appeal had expired 10 days after entry of the trial court’s initial order committing the petitioner for study under [171]*17118 U. S. C. § 4208 (b). Pointing out that § 4208 (b) provides that such a commitment “shall be deemed to be for the maximum sentence of imprisonment prescribed by law,” 2 the Court of Appeals reasoned that “at this point the defendant was on notice as to the extent of his punishment. If he desired to appeal, this was the time that he should have acted.” 3 307 F. 2d 839, 840. We granted certiorari, 371 U. S. 966, to consider questions which have arisen in the District Courts and Courts of Appeals in the application of 18 U. S. C. § 4208 (b).4
The procedural rules governing the usual course of criminal appeals in the federal judicial system are well settled. After a plea or finding of guilty, sentence is to be imposed “without unreasonable delay.” 5 A judgment of conviction setting forth the sentence is then entered,6 and a notice of appeal must be filed within 10 days thereafter.7 The record is filed with the Court of Appeals and [172]*172the appeal docketed within 40 days thereafter,8 and the appeal is heard “as soon ... as the state of the calendar will permit.” 9 Pending disposition of the appeal, the sentence is stayed unless the defendant elects otherwise,10 and the defendant may be released on bail.11
The dominant philosophy embodied in these rules reflects the twin concerns that criminal appeals be disposed of as expeditiously as the fair and orderly administration of justice may permit, and that the imposition of actual punishment be avoided pending disposition of an appeal. In the ordinary criminal case, where the imposition of a sentence follows promptly upon a determination of guilt, no problem arises in the application of these appellate rules or in the effectuation of the policies which they reflect. An appeal may not be taken until after the pronouncement of sentence, and must be taken promptly after sentence is imposed.
But under the provisions of 18 U. S. C. § 4208 (b) the trial judge sentences a convicted defendant not once, but twice. The judge first imposes a sentence of imprisonment “deemed to be” the maximum prescribed by the law, and then, after the defendant has been imprisoned for three or six months, the judge fixes a new sentence which may be quite different from the one originally imposed. The present case illustrates the problem which then arises. That problem, simply stated, is how, in cases where trial judges have utilized the sentencing provisions authorized by 18 U. S. C. § 4208 (b), the rules governing criminal appeals are to be applied so as neither to frustrate their purpose nor to impair the efficacy of the flexible sentencing procedure which Congress devised in enacting [173]*17318 U. S. C. § 4208 (b).12 We have concluded that in such cases an appeal may be taken within the time provided by Rule 37 (a)(2), Fed. Rules Crim. Proc., after either the first or the second sentence under § 4208 (b), at the option of the convicted defendant.
It would obviously contravene the basic policies of the criminal appellate rules to require a defendant sentenced under § 4208 (b) to defer his appeal until after he had submitted to the three or six months of incarceration and diagnostic study prescribed by the statute. Such a requirement would not only forestall any opportunity of a prompt appeal from an underlying criminal conviction, but would deprive a convicted defendant of the substantial right to be enlarged on bail while his appeal was pending. Indeed, the imposition of such a mandatory three- or six-month term of imprisonment before the defendant could file an appeal might raise constitutional problems of significant proportions.
But we need not consider such problems, because a § 4208 (b) commitment is clearly not lacking in sufficient “finality” to support an immediate appeal, and there is nothing to indicate that Congress intended that the right of appeal be mandatorily suspended in cases where the provisions of § 4208 (b) are utilized. The provisions of § 4208 (b) are invoked only after “a judgment of conviction.” 13 The defendant is committed under § 4208 (b) [174]*174“to the custody of the Attorney General” as in the case of all sentenced prisoners.14 It is provided that the term of the final sentence “shall run from date of original commitment under this section.”
A sentence under these provisions, which is imposed only after the whole process of the criminal trial and determination of guilt has been completed, sufficiently satisfies conventional requirements of finality for purposes of appeal. The litigation is complete as to the fundamental matter at issue — -“the right to convict the accused of the crime charged in the indictment.” Heike v. United States, 217 U. S. 423, 429. “Final judgment in a criminal case,” the Court has said, “means sentence. The sentence is the judgment.” Berman v. United States, 302 U. S. 211, 212. This concept was later explained and amplified in words of complete applicability here: “The 'sentence is judgment’ phrase has been used by this Court in dealing with cases in which the action of the trial court did not in fact subject the defendant to any form of judicial control. . . .
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Mr. Justice Stewart
delivered the opinion of the Court.
The petitioner was convicted by a jury in the United States District Court in Massachusetts upon a 75-count indictment for making false claims against the Govern[170]*170ment in violation of 18 U. S. C. § 287. The trial judge, after preliminary sentencing hearings, came to the conclusion that it would be helpful “for the Court to know something more about the defendant than I have seen or heard up to date.” Accordingly, the court entered an order committing the petitioner “to the custody of the Attorney General of the United States under Title 18, United States Code, 4208 (b).” 1 More than three months later, after considering the report which the Bureau of Prisons had submitted in accordance with § 4208 (b), the trial judge, in a proceeding at which the petitioner and his counsel were present, entered an order suspending imposition of sentence and placing the petitioner on probation for two years. Three days later the petitioner filed a notice of appeal.
Upon motion of the Government the appeal was dismissed as untimely, on the ground that the period for appeal had expired 10 days after entry of the trial court’s initial order committing the petitioner for study under [171]*17118 U. S. C. § 4208 (b). Pointing out that § 4208 (b) provides that such a commitment “shall be deemed to be for the maximum sentence of imprisonment prescribed by law,” 2 the Court of Appeals reasoned that “at this point the defendant was on notice as to the extent of his punishment. If he desired to appeal, this was the time that he should have acted.” 3 307 F. 2d 839, 840. We granted certiorari, 371 U. S. 966, to consider questions which have arisen in the District Courts and Courts of Appeals in the application of 18 U. S. C. § 4208 (b).4
The procedural rules governing the usual course of criminal appeals in the federal judicial system are well settled. After a plea or finding of guilty, sentence is to be imposed “without unreasonable delay.” 5 A judgment of conviction setting forth the sentence is then entered,6 and a notice of appeal must be filed within 10 days thereafter.7 The record is filed with the Court of Appeals and [172]*172the appeal docketed within 40 days thereafter,8 and the appeal is heard “as soon ... as the state of the calendar will permit.” 9 Pending disposition of the appeal, the sentence is stayed unless the defendant elects otherwise,10 and the defendant may be released on bail.11
The dominant philosophy embodied in these rules reflects the twin concerns that criminal appeals be disposed of as expeditiously as the fair and orderly administration of justice may permit, and that the imposition of actual punishment be avoided pending disposition of an appeal. In the ordinary criminal case, where the imposition of a sentence follows promptly upon a determination of guilt, no problem arises in the application of these appellate rules or in the effectuation of the policies which they reflect. An appeal may not be taken until after the pronouncement of sentence, and must be taken promptly after sentence is imposed.
But under the provisions of 18 U. S. C. § 4208 (b) the trial judge sentences a convicted defendant not once, but twice. The judge first imposes a sentence of imprisonment “deemed to be” the maximum prescribed by the law, and then, after the defendant has been imprisoned for three or six months, the judge fixes a new sentence which may be quite different from the one originally imposed. The present case illustrates the problem which then arises. That problem, simply stated, is how, in cases where trial judges have utilized the sentencing provisions authorized by 18 U. S. C. § 4208 (b), the rules governing criminal appeals are to be applied so as neither to frustrate their purpose nor to impair the efficacy of the flexible sentencing procedure which Congress devised in enacting [173]*17318 U. S. C. § 4208 (b).12 We have concluded that in such cases an appeal may be taken within the time provided by Rule 37 (a)(2), Fed. Rules Crim. Proc., after either the first or the second sentence under § 4208 (b), at the option of the convicted defendant.
It would obviously contravene the basic policies of the criminal appellate rules to require a defendant sentenced under § 4208 (b) to defer his appeal until after he had submitted to the three or six months of incarceration and diagnostic study prescribed by the statute. Such a requirement would not only forestall any opportunity of a prompt appeal from an underlying criminal conviction, but would deprive a convicted defendant of the substantial right to be enlarged on bail while his appeal was pending. Indeed, the imposition of such a mandatory three- or six-month term of imprisonment before the defendant could file an appeal might raise constitutional problems of significant proportions.
But we need not consider such problems, because a § 4208 (b) commitment is clearly not lacking in sufficient “finality” to support an immediate appeal, and there is nothing to indicate that Congress intended that the right of appeal be mandatorily suspended in cases where the provisions of § 4208 (b) are utilized. The provisions of § 4208 (b) are invoked only after “a judgment of conviction.” 13 The defendant is committed under § 4208 (b) [174]*174“to the custody of the Attorney General” as in the case of all sentenced prisoners.14 It is provided that the term of the final sentence “shall run from date of original commitment under this section.”
A sentence under these provisions, which is imposed only after the whole process of the criminal trial and determination of guilt has been completed, sufficiently satisfies conventional requirements of finality for purposes of appeal. The litigation is complete as to the fundamental matter at issue — -“the right to convict the accused of the crime charged in the indictment.” Heike v. United States, 217 U. S. 423, 429. “Final judgment in a criminal case,” the Court has said, “means sentence. The sentence is the judgment.” Berman v. United States, 302 U. S. 211, 212. This concept was later explained and amplified in words of complete applicability here: “The 'sentence is judgment’ phrase has been used by this Court in dealing with cases in which the action of the trial court did not in fact subject the defendant to any form of judicial control. . . . But certainly when discipline has been imposed, the defendant is entitled to review.” Korematsu v. United States, 319 U. S. 432, 434.
For these reasons it is clear to us that the petitioner in the present case could have appealed his conviction within 10 days after the entry of the original commitment order under § 4208 (b). Had he done so, the Court of Appeals could have reviewed all claims of error in the trial proceedings, and its determination would have been final,15 subject only to discretionary review by this Court.
[175]*175It does not follow, however, simply because a defendant could have sought review of his conviction after the initial commitment under § 4208 (b), that Congress intended to deny altogether the right of appeal to a defendant who chose to adopt the course followed by the petitioner in the present case. While an initial commitment under § 4208 (b) is, as we have pointed out, freighted with sufficiently substantial indicia of finality to support an appeal, the fact remains that the proceedings in the trial court are not actually terminated until after the period of diagnostic study, review of the same by the district judge, and final sentence. Cf. United States v. Behrens, ante, p. 162. There might be many reasons why a convicted defendant or his counsel would prefer to await final termination of the trial court proceedings before taking an appeal. For instance, a defendant might think, rightly or wrongly, that the trial court’s knowledge that an appeal had already been taken might adversely influence the court’s discretion in imposing final sentence. Moreover, if every defendant initially committed under § 4208 (b) to the maximum prison term prescribed by law were faced [176]*176with the choice of then and there seeking review of his conviction or forever losing the right of appeal, he might well feel obliged to take an appeal because of his very ignorance of what his sentence was eventually going to turn out to be. As a practical matter, the severity of the sentence actually imposed might in any case be a major factor in determining whether an appeal is to be taken.
Long-accepted and conventional principles of federal appellate procedure require recognition of the defendant’s right to await the imposition of final sentence before seeking review of the conviction. That is the general rule. Miller v. Aderhold, 288 U. S. 206; Berman v. United States, 302 U. S. 211; Cobbledick v. United States, 309 U. S. 323; Rule 37 (a), Fed. Rules Crim. Proc. We find nothing to indicate that Congress intended to depart from that rule in enacting § 4208 (b).
Reversed