TC,
I have no real clue to the meaning of the stamp, but I have seen the "pistol number" only for a unit stamp, stamped below the toggle on the rear of the frame. I have never seen this on the sideplate, but these stamps were usually put on by local armorers, or unit repair depots.
Is there any indication that there was a unit stamp on the gripstraps? This would be my best guess.
Marvin
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