Well, now that you ask!
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Several more have arrived since this image was made. These are all 45 ACP.
You tell me.
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Again, all ACP.
Okay, only the bottom 3 are 1917s, one military and two commercial. The upper left is a Model 25-2 that I used in competition. The upper right is the Model 22-4 built to be a modern replica of the revolver just below it, the Model 1950, Army revolver. The Model 1950 is one of the rarer Models produced, only 3976 were made.
Kevin