Appellant was convicted in a jury trial of criminal conspiracy, 18 Pa.C.S. § 903, theft by unlawful taking of movable property 18 Pa.C.S. § 3921(a), theft by receiving stolen goods, 18 Pa.C.S. § 3925, and retail theft, 18 Pa.C.S. § 3929. Post-verdict motions were filed and denied. Concurrent sentences of three to six years for theft of movable property and two-and-a-half to five years for retail theft were imposed. The sentence for criminal conspiracy was three to six years, to run consecutive to the other two sentences. 1
I.
Appellant’s first contention is that the evidence was insufficient to support the verdicts. Extensive testimony from two Commonwealth witnesses established that on the afternoon of September 4, 1976 appellant and a companion entered the Bailey, Banks & Biddle store in Bala Cynwyd, *510 Montgomery County. Appellant looked at several valuable diamond rings for sale, and said that he would be back with a $500 check in order to make a deposit on one. A few hours later, appellant returned with his companion and asked to see a diamond ring which sold for about $12,000. While appellant was holding the ring and examining it, the companion slowly walked to the front door of the store and opened it. Carrying the ring, appellant then suddenly bolted for the door, and both he and his companion fled. The thorough identification testimony from the eyewitnesses was corroborated by expert testimony concerning the handprints appellant had left on the store counter, which had been wiped clean shortly before he and his companion arrived the second time. Viewed in the light most favorable to the Commonwealth as verdict winner, the evidence was clearly sufficient for the jury to infer guilt beyond a reasonable doubt for criminal conspiracy, theft by unlawful taking, and retail theft. 2
II.
Appellant also claims he is entitled to discharge because the court below erred in denying his motion to dismiss all charges under Pennsylvania Rule of Criminal Procedure 1100, for failure to commence trial within 180 days of the filing of the complaint. The complaint was filed on September 10, 1976. Trial commenced 279 days later on June 17, 1977. However, Rule 1100(d) provides in pertinent part:
“In determining the period for commencement of trial, there shall be excluded therefrom such period of delay at any stage of the proceeding as results from:
. (1) the unavailability of the defendant. . .. ”
Appellant was still at large when the complaint was filed, and a warrant was issued for his arrest. The Commonwealth is entitled to the unavailability exclusion if it
*511
establishes by a preponderance of the evidence that police acted with due diligence in executing the arrest warrant.
Commonwealth v. Mitchell,
*512 III.
Appellant contends that he could not properly be convicted of theft by unlawful taking, receiving stolen goods or conspiracy, and that the trial judge erred in charging the jury that the appellant could be convicted of these crimes. Appellant’s argument is that the legislature intended that thefts from retail establishments should be governed solely by the specific provisions on retail theft in 18 Pa.C.S. § 3929. This claim could have been raised, but was not, in a pre-trial motion to quash the informations charging theft by unlawful taking, receiving stolen goods and conspiracy. Therefore the trial judge properly found the claim waived by failure to raise it pre-trial.
Commonwealth v. Williams,
IV.
Appellant claims that his being sentenced for retail theft, theft by unlawful taking and criminal conspiracy violated: (A) the rules of statutory construction; and (B) the doctrine of merger and appellant’s double jeopardy rights.
A.
Appellant’s statutory construction argument is that because the provisions of the retail theft statute are specific, they were intended by the legislature to be the exclusive provisions under which someone committing a theft from a retail establishment could be sentenced. This argument raises, under the rubric of sentencing, precisely the same attack on the validity of the underlying convictions as the claim we previously found waived in part III under
Commonwealth v. Williams, supra,
for failure to raise it in a
*513
pre-trial motion to quash the informations charging crimes other than retail theft.
5
Appellant cannot avoid this waiver of a nonjurisdictional issue
6
merely by relabelling it as an attack on the legality of the sentence.
Commonwealth v. Montgomery,
B.
Since all of appellant’s sentences were for non-capital crimes, there, arises the problem, unique to Pennsylvania,
7
of whether the state double jeopardy clause, Pa. Const., art. I, § 10, is applicable. In cases spanning more than a century, our Supreme Court held that the Pennsylvania double jeopardy clause applies only to capital offenses.
E. g., Commonwealth
v.
Baker,
*516
. With respect to criminal conspiracy, both appellant’s merger and double jeopardy claims must fail. The Crimes Code in no way changed the settled rule that criminal conspiracy does not merge into the completed offense which is the object of the conspiracy.
Commonwealth v.
*517
Miller,
We agree with appellant, however, that he could not receive concurrent sentences for both theft by unlawful taking and retail theft, since both convictions arose out of the single act of theft of the diamond ring.
13
Once proof of the theft by unlawful taking was complete, so was proof of the retail theft, and vice-versa. It is therefore unquestionable that the two crimes merged for sentencing purposes, and appellant could be sentenced for only one.
14
Commonwealth
*518
v. Nelson,
The only question remaining is for which crime appellant could be sentenced. We believe it is clear from
Commonwealth v. Nelson, supra,
that when crimes merge for sentencing purposes, the one for which a defendant may be sentenced is the most serious crime, i. e., the one to which the legislature attached the greatest possible maximum penalty.
See also Commonwealth ex rel. Shaddock v. Ashe,
When the issue is analyzed in terms of double jeopardy,
Commonwelath v. Walker,
While no case has dealt with this issue under Pennsylvania’s double jeopardy clause, we believe the reasoning of
Nelson,
with respect to merger, and
Walker,
regarding federal double jeopardy, applies equally to Pennsylvania double jeopardy. Both the merger doctrine and the federal and state double jeopardy clauses are aimed at preventing the unfairness of punishing a defendant twice for what is essentially the same offense.
See Ex parte Lange,
In this case, the theft by unlawful taking was a felony of the third degree with a maximum penalty of seven years,
see
18 Pa. C.S. §§ 1103, 3903, while the retail theft was a misdemeanor of the first degree, carrying a maximum penalty of five years.
See
18 Pa.C.S. §§ 1104, 3929(b)(4). We will therefore vacate the judgment of sentence for retail theft. There is no need to remand for resentencing on the
*521
other convictions, since it is clear from the sentencing transcript that the trial judge was not influenced by the retail theft conviction in imposing the other sentences.
Commonwealth v. Jellots,
Judgments of sentence for theft by unlawful taking and criminal conspiracy affirmed; judgment of sentence for retail theft vacated.
Notes
. The trial judge properly imposed no sentence for receiving stolen goods, since that conviction arose out of the same theft as the conviction for theft by unlawful taking.
Commonwealth v. Simmons,
. Since appellant properly received no sentence on the conviction for receiving stolen goods,
see
note 1,
supra,
it is unnecessary to consider the sufficiency of the evidence for this conviction.
Commonwealth v. Nelson,
. The proof of due diligence in this case meets the criteria of both the majority (“only reasonable efforts”) and the dissenters (“more than reasonable effort”-“devoted and painstaking manner”) in
Commonwealth v. Hinton,
. During the period that appellant was at large, the Commonwealth filed a petition for extension under Rule of Criminal Procedure 1100(c). This petition, containing only a conclusory allegation of due diligence by the Commonwealth, was granted ex parte by the criminal motions judge in the court below. There is no indication in the record that the Commonwealth ever presented any evidence of due diligence when the petition was granted. Appellant is clearly correct in contending that this extension order was invalid, both because the Commonwealth’s conclusory allegations failed to sustain its burden of proving due diligency by a preponderance of the evidence,
Commonwealth v. Ehredt,
. Portions of appellant’s arguments indicate that he has confused his “more specific offense” claim, with which we have dealt in parts III and IV-A of the text, with his “merger” claim, discussed in part IV-B. Judge Spaeth has written an excellent explanation of this difficult distinction in
Commonwealth v. Brown,
. When a court takes action beyond the power conferred on it by law (its jurisdiction), its action is a nullity, and objection to it cannot be waived by the defendant.
Commonwealth v. Hall,
.
See
Hall, Kamisar, La Fave, Israel, Modern Criminal Procedure (1969) at 1213;
cf. In Memory of
Honorable Horace Stern, Remarks of the Honorable Henry J. Friendly,
. The non-capital offense involved in
Commonwealth v. Brown,
. The non-capital offense involved in
Commonwealth v. Tome,
.
Commonwealth v. Perry,
The holding in
Commonwealth v. Baker,
. Throughout this case, both in this court and the lower court, appellant has used the term “double jeopardy” without specifically referring to either the federal or Pennsylvania double jeopardy clauses. We do not believe, however, that we should refuse to consider the two double jeopardy clauses for lack of sufficient specificity.
Cf. Commonwealth v. Wyant,
We recognize that ordinarily a court should not raise issues
sua sponte.
See, e.
g., Wiegand v. Wiegand,
We therefore may and must raise it ourselves, even if it has never been raised either in the lower court or on appeal.
Commonwealth v. Usher,
Since we determine,
infra,
that appellant’s concurrent sentences for both theft and retail theft violated his rights under Pennsylvania merger doctrine, it would not ordinarily be necessary for us to go on to consider whether these sentences also violated the double jeopardy clauses. However, we do not grant appellant all relief which he requests on the merger issue, since he claims that the three to six year sentence for theft by unlawful taking should be vacated, rather than the two-and-a-half to five year sentence for retail theft. Therefore we shall consider the applicability of the double jeopardy clauses in order to determine if they entitle appellant to the greater relief which he seeks.
See Commonwealth v. Golden,
. We read the reference to “double jeopardy” in
Commonwealth v. Corcoran,
. There is no merit to the Commonwealth’s contention that any error was harmless because the sentences were concurrent rather than consecutive.
Commonwealth
v.
Walker,
. Appellant’s brief includes in its discussion of merger what appears to be a separate argument that section 3902 of the Crimes Code provides an additional basis for concluding that only one sentence be imposed on his theft and retail theft convictions.
Cf. Commonwealth v. Shaffer,
. Under the Crimes Code, we no longer have this anomalous situation. See 18 Pa.C.S. §§ 2701, 2702.
.
Busic v. United States, supra,
note 5, at
. The Pennsylvania courts have uniformly applied the same test (i. e., sustaining the sentence for the crime with the highest maximum penalty) in closely analogous situations. One such situation frequently arises under section 3502(d) of the Crimes Code, 18 Pa.C.S. § 3502(d), which provides:
“Multiple convictions.-A person may not be convicted both for burglary and for the offense which it was his intent to commit after the burglarious entry for an attempt to commit that offense, unless the additional offense constitutes a felony of the first or second degree.”
A defendant, for example, may not be convicted of both burglary and the theft he intended to commit, since theft under the Crimes Code can rise no higher than a felony of the third degree. 18 Pa.C.S. § 3503. Strictly speaking, this is not “merger,” but explicit statutory prohibition, although its operation is so similar that the term merger is frequently applied to it.
E. g., Commonwealth v. Harris,
In a situation in which a defendant has been convicted of both burglary and the theft he intended to commit, the same question is presented as in this case, because the statute does not say whether it is the burglary or the intended crime for which the defendant can be punished. But it is self-evident that the legislature could not have intended that a defendant convicted of the first-degree felony of burglary would have his maximum possible punishment of 20 years imprisonment reduced to five years by the fact that he was also convicted for theft, when he could be sentenced up to the full twenty years if he had been convicted of the burglary alone. Therefore when the problem arises in this court, the judgment of sentence for burglary is routinely sustained and the other vacated.
Commonwealth
v.
Harris, supra; Commonwealth v. Price, supra; Commonwealth v. Simmons,
