CERCONE, Judge:
This is an appeal from appellant’s judgment of sentence, for robbery and various weapons offenses, to a term of imprisonment of not less than five years nor more than ten years in a state correctional institution.
The Commonwealth’s evidence established that in the early evening of February 6,1974 appellant and a co-defendant robbed P. & J. Enterprises in Philadelphia. The owner, Patrick Jurado, and an associate present at the time of the robbery, Edgar Hildalgo, gave the police a complete description of the two men. On February 8, 1974, Lt. Benson of the Philadelphia Police Department returned to P. & J. Enterprises and displayed six photographs to the victim and his associate. They identified appellant and a criminal complaint was issued on the same day with appellant being arrested five days later. Appellant’s motion to suppress was heard and later denied. On December 9, 1974, appellant’s motion to dismiss pursuant to Pa.R.Crim.P. 1100 was denied. Trial commenced on December 13, 1974, and a jury returned a verdict of guilty on all counts. Post-trial motions were filed and denied by the trial judge and appellant was sentenced.
Appellant first contends that the testimony of both Lt. Benson and Mr. Jurado referring to appellant’s identification from photographs in the possession of the police improp[145]*145erly introduced evidence of appellant’s prior criminal activity-
In Commonwealth v. Allen, 448 Pa. 177, 181, 292 A.2d 373, 375 (1972), our Supreme Court articulated the standard which governs a review of testimony related to a photographic display:
“The suggestion that any reference to a defendant’s photograph is so prejudicial that an inflexible rule of reversal must apply is explicitly rejected. We hold that after the reference to a photograph the controlling question is whether or not a juror could reasonably infer from the facts presented that the accused had engaged in prior criminal activity. A mere passing reference to photographs from which a reasonable inference of prior criminal activity cannot properly be drawn does not invalidate the proceedings since there has been no prejudice as a result of the reference . . . .”
Thus, the seminal question when there has been a reference to photos is whether or not a juror could reasonably infer that the accused had engaged in prior criminal activity. See also Commonwealth v. Groce, 452 Pa. 15, 303 A.2d 917 (1973).
In the instant case, the first reference to photographs was elicited by appellant on cross-examination of the complaining witness. Counsel for the co-defendant of appellant also elicited the fact that the witness had identified appellant’s picture from a group of photographs. Lt. Benson then briefly mentioned the photos on direct examination and appellant objected. Putting all three references together, it is possible that a juror could reasonably infer prior criminal activity on the part of appellant. However, in light of the fact that appellant initially questioned the complainant concerning the photographic display and that appellant did not object to co-defendant’s counsel’s question concerning the identification of appellant, we conclude that appellant is not in a position to object at this time, because any error committed through the initial questioning was waived by appellant. Commonwealth v. Clair, 458 Pa. 418, 326 A.2d 272 (1974). Thus, the subsequent reference to the photos by [146]*146Lt. Benson was harmless. Commonwealth v. Padgett, 428 Pa. 229, 237 A.2d 209 (1968).
Appellant next contends that the lower court committed reversible error in ruling that appellant’s prior burglary conviction could be used to impeach him if he took the stand, asserting that this erroneous ruling prevented appellant from testifying and, thus, denied him a fair trial. In Commonwealth v. Bighum, 452 Pa. 554, 307 A.2d 255 (1973) our Supreme Court adopted the approach of Luck v. United States, 121 U.S.App.D.C. 151, 348 F.2d 763 (1965) and established that a balancing test is to be used in determining when prior convictions could be used to impeach a defendant’s credibility and that this test was within the exercise of judicial discretion. The Luck court stressed this proposition when it stated, “[t]he matter is, we reiterate, one for the exercise of discretion; and, as is generally in accord with sound judicial administration, that discretion is to be accorded a respect appropriately reflective of the inescapable remoteness of appellate review.” 348 F.2d at 769. However, neither Luck nor Bighum grant the trial court absolute discretion in determining when prior convictions can be used to impeach a defendant’s credibility, but rather the trial court’s exercise of discretion is reviewable by an appellate court within certain considerations. Some of the considerations noted in Bighum include the age and nature of the prior crimes, the length of the criminal record and the age and circumstances of the defendant. 452 Pa. at 567, 307 A.2d at 263. Probably the most important consideration or, as the Bighum court said, the factor “of critical importance” is “the extent to which it is more important to the search for truth in a particular case for the jury to hear the defendant’s story than to know of a prior conviction.” 452 Pa. at 567, 307 A.2d at 263. See also Luck v. United States, 348 F.2d at 769. In the instant case appellant was an adult offender who had recently pleaded guilty to a crime of a type generally admissible for impeachment,1 and appellant [147]*147had four alibi witnesses who were called, thus presenting his version of the facts to the jury. Therefore, we hold that the lower court’s exercise of its discretion was proper and we find this assignment of error to be without merit.
Third, appellant argues that the lower court erred in limiting his right to cross-examine the complainant as to: a) prior inconsistent statements; b) complainant’s prior record; and c) complainant’s insurance coverage. Initially, it should be noted that although cross-examination is a matter of right, the bounds of proper cross-examination are within the sound discretion of the trial judge. Commonwealth v. Bailey, 450 Pa. 201, 299 A.2d 298 (1973); Commonwealth v. Butler, 232 Pa.Super. 283, 331 A.2d 678 (1974). At trial, the complainant testified that he was shown photographs twice, while at the suppression hearing he had testified that he had been shown photographs only once. The lower court made the following ruling with regard to appellant’s cross-examination of the complainant:
“You may interrogate him as to whether he saw any photographs on another occasion.
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CERCONE, Judge:
This is an appeal from appellant’s judgment of sentence, for robbery and various weapons offenses, to a term of imprisonment of not less than five years nor more than ten years in a state correctional institution.
The Commonwealth’s evidence established that in the early evening of February 6,1974 appellant and a co-defendant robbed P. & J. Enterprises in Philadelphia. The owner, Patrick Jurado, and an associate present at the time of the robbery, Edgar Hildalgo, gave the police a complete description of the two men. On February 8, 1974, Lt. Benson of the Philadelphia Police Department returned to P. & J. Enterprises and displayed six photographs to the victim and his associate. They identified appellant and a criminal complaint was issued on the same day with appellant being arrested five days later. Appellant’s motion to suppress was heard and later denied. On December 9, 1974, appellant’s motion to dismiss pursuant to Pa.R.Crim.P. 1100 was denied. Trial commenced on December 13, 1974, and a jury returned a verdict of guilty on all counts. Post-trial motions were filed and denied by the trial judge and appellant was sentenced.
Appellant first contends that the testimony of both Lt. Benson and Mr. Jurado referring to appellant’s identification from photographs in the possession of the police improp[145]*145erly introduced evidence of appellant’s prior criminal activity-
In Commonwealth v. Allen, 448 Pa. 177, 181, 292 A.2d 373, 375 (1972), our Supreme Court articulated the standard which governs a review of testimony related to a photographic display:
“The suggestion that any reference to a defendant’s photograph is so prejudicial that an inflexible rule of reversal must apply is explicitly rejected. We hold that after the reference to a photograph the controlling question is whether or not a juror could reasonably infer from the facts presented that the accused had engaged in prior criminal activity. A mere passing reference to photographs from which a reasonable inference of prior criminal activity cannot properly be drawn does not invalidate the proceedings since there has been no prejudice as a result of the reference . . . .”
Thus, the seminal question when there has been a reference to photos is whether or not a juror could reasonably infer that the accused had engaged in prior criminal activity. See also Commonwealth v. Groce, 452 Pa. 15, 303 A.2d 917 (1973).
In the instant case, the first reference to photographs was elicited by appellant on cross-examination of the complaining witness. Counsel for the co-defendant of appellant also elicited the fact that the witness had identified appellant’s picture from a group of photographs. Lt. Benson then briefly mentioned the photos on direct examination and appellant objected. Putting all three references together, it is possible that a juror could reasonably infer prior criminal activity on the part of appellant. However, in light of the fact that appellant initially questioned the complainant concerning the photographic display and that appellant did not object to co-defendant’s counsel’s question concerning the identification of appellant, we conclude that appellant is not in a position to object at this time, because any error committed through the initial questioning was waived by appellant. Commonwealth v. Clair, 458 Pa. 418, 326 A.2d 272 (1974). Thus, the subsequent reference to the photos by [146]*146Lt. Benson was harmless. Commonwealth v. Padgett, 428 Pa. 229, 237 A.2d 209 (1968).
Appellant next contends that the lower court committed reversible error in ruling that appellant’s prior burglary conviction could be used to impeach him if he took the stand, asserting that this erroneous ruling prevented appellant from testifying and, thus, denied him a fair trial. In Commonwealth v. Bighum, 452 Pa. 554, 307 A.2d 255 (1973) our Supreme Court adopted the approach of Luck v. United States, 121 U.S.App.D.C. 151, 348 F.2d 763 (1965) and established that a balancing test is to be used in determining when prior convictions could be used to impeach a defendant’s credibility and that this test was within the exercise of judicial discretion. The Luck court stressed this proposition when it stated, “[t]he matter is, we reiterate, one for the exercise of discretion; and, as is generally in accord with sound judicial administration, that discretion is to be accorded a respect appropriately reflective of the inescapable remoteness of appellate review.” 348 F.2d at 769. However, neither Luck nor Bighum grant the trial court absolute discretion in determining when prior convictions can be used to impeach a defendant’s credibility, but rather the trial court’s exercise of discretion is reviewable by an appellate court within certain considerations. Some of the considerations noted in Bighum include the age and nature of the prior crimes, the length of the criminal record and the age and circumstances of the defendant. 452 Pa. at 567, 307 A.2d at 263. Probably the most important consideration or, as the Bighum court said, the factor “of critical importance” is “the extent to which it is more important to the search for truth in a particular case for the jury to hear the defendant’s story than to know of a prior conviction.” 452 Pa. at 567, 307 A.2d at 263. See also Luck v. United States, 348 F.2d at 769. In the instant case appellant was an adult offender who had recently pleaded guilty to a crime of a type generally admissible for impeachment,1 and appellant [147]*147had four alibi witnesses who were called, thus presenting his version of the facts to the jury. Therefore, we hold that the lower court’s exercise of its discretion was proper and we find this assignment of error to be without merit.
Third, appellant argues that the lower court erred in limiting his right to cross-examine the complainant as to: a) prior inconsistent statements; b) complainant’s prior record; and c) complainant’s insurance coverage. Initially, it should be noted that although cross-examination is a matter of right, the bounds of proper cross-examination are within the sound discretion of the trial judge. Commonwealth v. Bailey, 450 Pa. 201, 299 A.2d 298 (1973); Commonwealth v. Butler, 232 Pa.Super. 283, 331 A.2d 678 (1974). At trial, the complainant testified that he was shown photographs twice, while at the suppression hearing he had testified that he had been shown photographs only once. The lower court made the following ruling with regard to appellant’s cross-examination of the complainant:
“You may interrogate him as to whether he saw any photographs on another occasion. You may confront him with the fact that he testified previously whatever it was that he did testify to, but you are to abstain from any questions pertaining to what kind of photographs were shown, whether they were at that point identified in any fashion. . . . As to the contradiction of testimony, you have every right to interrogate him and confront him.”
Thus, the restriction imposed by the court was designed to prevent appellant’s counsel from eliciting testimony about the identification itself. Since this was a joint trial the court was obviously correct in its caution because, although the photographic identification of appellant was not suppressed, the photographic identification of appellant’s co-defendant had been ordered suppressed. Thus, the trial judge [148]*148was avoiding the danger that the complainant would explain that he identified the co-defendant at the suppressed photographic identification. Cross-examination was otherwise complete. Therefore, the record indicates that the trial court was correct in its limitation, and we find this assignment of error to be without merit.
As to the complaining witness’ prior criminal record, a review of the record in this case indicates that on' cross-examination the complainant testified to pleading guilty to a federal charge. The record indicates that the following exchange took place within the hearing of the jury.
“Q. [Counsel for appellant] Have you ever been convicted of a crime, Mr. Jurado?
A. [The complainant] Well, I have been convicted of acknowledging false documents, yes.
Q. Where is that at? In the Federal Court?
A. Federal Court .
Q. What was that concerning?
A. It was concerning some statements that some clients had made in my office, and which later turned out to be false, and I was indicted in the Federal Court concerning that particular — those particular statements, and in Federal Court I chose to plead guilty to the charge, and I was charged with acknowledging false documents.
Q. Why did you plead guilty? Were you guilty?
A. I chose not to fight the case, because it was rather circumstantial, and it is personal. .
THE COURT: May we have a date of that particular matter? What was the date? .
[Counsel for appellant]: It was September the 11th, 1974, before Judge Fullem.
THE COURT: Thank you. That is sufficient. . . . ”
The lower court then sustained objections to the questions:
“Were you guilty?”
“Did you plead to receiving $800 for falsifying marriage
certificates to smuggle people into the country?”
[149]*149“Did you receive any money for falsifying those documents?”
Once again we find that the lower court did not abuse its discretion. In general, such impeaching evidence is limited to the fact of conviction, and it is not permissible to show the details and incidents of the crime beyond the name of the crime and the time and place of conviction. United States v. Mitchell, 427 F.2d 644 (3d Cir. 1970). In its opinion, the lower court noted that this limitation on cross-examination was imposed to “avoid a prolonged foray into a collateral matter.” We agree with the lower court that the details sought by appellant were collateral, and not necessary to the impeachment process. The name of the crime and the time and place of conviction were sufficient for this purpose, so we find no abuse of discretion by the lower court.
Appellant also contends that the lower court erred in limiting appellant’s right to cross-examine complainant as to his insurance coverage. Appellant contends that, had this line of questioning been allowed, the jury could have found that the alleged incident was an insurance fraud rather than a robbery. The insurance coverage issue would only be relevant if the defense were asserting insurance fraud, and nowhere in the record does appellant offer any evidence to support such an allegation. Secondly, the jury did hear that complainant had insurance coverage. Thirdly, when the lower court sustained the Commonwealth’s objection, appellant could have explained that one of his theories of defense was insurance fraud and, thus, demonstrate to the lower court the relevance of this line of questioning at the time of the ruling, but he did not. Therefore, we find that no prejudicial error was committed in the instant case, in view of the overwhelming evidence supporting the conviction and the unsupported and speculative nature of any insurance fraud theory.
Finally, appellant maintains that his right to a speedy trial under Pa.R.Crim.P. 1100 was violated and, therefore, [150]*150that he should be discharged.2 Although we disagree with the computation of time set forth by both the lower court and the Commonwealth, we nevertheless hold that appellant’s trial commenced within the period mandated by Rule 1100.
Rule 1100 of the Pennsylvania Rules of Criminal Procedure, which was promulgated in response to our Supreme Court’s opinion in Commonwealth, v. Hamilton, 449 Pa. 297, 297 A.2d 127 (1972), requires a trial to commence within 270 days in actions brought between June 30, 1973 and June 30, 1974.3
In the instant case, trial was commenced on December 13,1974, which was thirty-eight days beyond the 270-day period generally mandated by Rule 1100 and, as our Supreme Court recently held in Commonwealth v. Shelton, 469 Pa. 8, 364 A.2d 694 (1976), this delay “must be either excluded from the computation of the period, Pa.R.Crim.P. 1100(d), or justified by an order granting an extension pursuant to the terms of the rule, Pa.R.Crim.P. 1100(c), if the Commonwealth is to prevail.” 469 Pa. at 14, 364 A.2d at 697. Since the Commonwealth does not argue that they should have been granted an extension,4 the 38-day delay beyond the 270-day period must be excluded under subsection (d) of Rule 1100 in order for the Commonwealth to prevail. Rule 1100(d) provides:
[151]*151“In determining the period for commencement of trial, there shall be excluded therefrom such period of delay at any stage of the proceedings as results from:
(1) the unavailability of the defendant or his attorney;
(2) any continuance in excess of thirty (30) days granted at the request of the defendant or his attorney, provided that only the period beyond the thirtieth (30th) day shall be so excluded.”
The record discloses the following facts. On September 4, 1974, appellant’s counsel was on trial before another judge and therefore, could not appear on behalf of appellant. At counsel’s request the case was continued until September 25th. At that time, appellant’s counsel requested a continuance for personal reasons, and the case was continued to October 28th. On October 23rd, however, another continuance, until November 6th was granted. Although the history recited by the lower court labels that last continuance the result of a request by counsel for the co-defendant, the transcript of the hearing on appellant’s motion to dismiss supports the Commonwealth’s position that the October 23rd continuance was requested by appellant’s counsel.5 Therefore, the record indicates that the delay of 63 days between September 4, 1974 and November 6, 1974 was a result of either the unavailability of appellant’s counsel or continuances granted to appellant. Pa.R.Crim.P. 1100(d)(2) provides that the first 30 days are not to be excluded from determining the period for commencement of trial. Thus 33 [152]*152days are automatically excluded, by Rule 1100(d), from the computation of the 270-day period.
As noted above, trial was commenced 38 days beyond the 270-day period mandated by Rule 1100. This figure was derived by taking the total number of days between the date the complaint was filed, February 8, 1974, aiid the date trial commenced, December 13, 1974, and subtracting therefrom the 270-day period. However, both appellant and the Commonwealth treat February 13, 1974, the date of arrest, rather than February 8,1974, the date the complaint was filed, as the first day of the 270-day period. As previously noted, the 270-day period can be extended if any delay results from the unavailability of the accused. Pa.R.Crim.P. 1100(d)(1). Further, the police’s inability to find an accused can amount to unavailability. The Comment to Rule 1100 provides in pertinent part, that:
“For purposes of subparagraph (d)(1), in addition to any other circumstances precluding the availability of the defendant or his attorney, the defendant should be deemed unavailable for any period of time during which he could not be apprehended because his whereabouts were unknown and could not be determined by due diligence.”
Thus, it is clear that upon a showing of due diligence the Commonwealth could automatically exclude the five-day period between the filing of the complaint and the arrest because of defendant’s unavailability so that appellant would have been tried within the mandated time period. While the record reveals no attempt by the Commonwealth to make a showing of due diligence, appellant has admitted his own unavailability by not raising the question at the hearing on his motion to dismiss under Rule 1100. Cf. Commonwealth v. Clair, 458 Pa. 418, 326 A.2d 272 (1974).6 [153]*153Had appellant not conceded that the operative time for the purposes of Rule 1100 was the date of his arrest, and not the date of the filing of the complaint, the Commonwealth may have proved that appellant was indeed unavailable in that “his whereabouts were unknown and could not be determined by due diligence. . . .” Since appellant has conceded for the purpose of this argument that the five days between the filing of the complaint and appellant’s arrest are not chargeable to the Commonwealth, we shall presume that, had the question been raised, the Commonwealth would have shown due diligence in seeking to apprehend appellant.7
It is held that 33 days of the 63-day period between September 4, 1974 and November 6, 1974 should be excluded from the computation of the 270-day period. It is further held that the 5-day period between the filing of the complaint and appellant’s arrest should also be excluded from the computation of the 270-day period due to the presumed unavailability of appellant. Therefore, trial commenced on the 270th day, within the permissible period of Pa.R.Crim.P. 1100(a)(1).
The judgment of sentence is, therefore, affirmed.
SPAETH, J., concurs in the result.
HOFFMAN, J., files a dissenting opinion in which PRICE, J., joins.