The Swartz cut in the commercial-marked WWII Colt slides used in the 930-935K serial range is standard. The Swartz cuts were made in both the slides and the receivers prior to the external markings being applied. So all the commercial-marked slides transferred to military use in 1942 and 1943 had the Swartz cut in them.
There are several variations of C/M transfer pistols with different parts transferred. I think the lowest numbered WWII Colt receiver I've seen with an S-marked C/M recevier is 798021. I suspect the highest is about 890-900K.
I've only seen (2) WWII Colt receivers outside the C/M re-numbered range (860003-ca. 866700) with a Swartz-cut receiver that was NOT re-numbered. One was a Britishcommercial-proved piece in the 90x,xxx serial range. The other is 872308 that I have. From the outside, both of those pistols look like standard military pistols. It sometimes pays to look inside pistols that are otherwise plain-jane-looking.
On the WWI M1911 pistols, there were some interesting C/M variations other than the ones with the double-marked slides that the OP shows. There were some, like 334194, that have receivers transferred and are marked S on the receiver tops. That pistol is also interesting because it falls into a range where there were several Navy pistols. I need to letter it.
There were others with all the standard commercial markings (including a C-prefix serial number), BUT they had a military final acceptance mark. These pistols were desperately needed in mid-1918 and were transferred about the same time Colt omitted some of the normal production steps to increase the rate of production. They therefore have an Eagle's Head/S final inspection.
Even though some of these C/M WWI and WWII variations are scarcely seen, they do not necessarily have the same level of desirabilty or value with some collectors. They all seem to have different values and there is no set standards to determine what they are. Values are always subjective.
For example, the C/M slide pistols, like the one Troy shows and my 930917 are rare, but based on what I've seen, they typically don't sell for nearly as much as the C/M re-numbered pieces in the 860003-ca. 866700 serial range. That doesn't make much sense, because they are more rarely seen examples. I think part of that is due to people not recognizing them for what they are. Mr. Clawson devotes a good bit of information on the re-numbered pieces. I think that influences the perception of collectors, as well. More people seem to understand what the C/M re-numbered pieces are and want one. They are more distinctly different, based on them being entire pistols that were transferred and totally converted from a beautiful commercial blue pistol to a mere Parkerized military piece.
I personally like all the C/M and M/C transfers because they are something out of the norm. I hadn't really thought of it before, but more than 10% of my collection is C/M or M/C transfers. But I'll admit, I'm hooked on them.
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