You are probably correct. I mostly know about the Boston Police Dept and their armorers. They stamped B.P.D. and rack numbers on two of the S&W Victory models that BPD got, they did it so hard that they bent the backstraps. They also when the dept needed snubbies cut down 4" barrels to 2" both those are documented (they even recrowned the barrels). I have a S&W pre-Model 45 (.22 LR) one of 25 guns the dept got that is part of a limited run by S&W of a total of 6 inch barrels ever made in the "Post Office" model, extremely rare (check the S&W catalog) and the cylinder belongs to another of the BPD pre-model 45's, they took them apart and putting them back together weren't careful at all. The serial number on the cylinder is from another of the BPD pre-model 45's.
what I am getting at is that departments change things around, so I am sure the Italians probably did, but I know the M1's are as they came from Italy
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However that being said if I ever track down the other pre-45 would I get the person who has it to swap cylinders? I would. The problem is that there are only 2 other guns still known, although I heard a rumor that there is one existing in SE Massachusetts, but that was just a rumor. It is interesting having 1 of 3 guns known ever made by S&W in that configuration.