I roughly see a /2 on barrel as well.
It might be an initially rejected pistol, later had the problem fixed, but another gun occupied its s/n, so a /2 was added to this one. Or, same number was applied on two pistols (by operational mistake), the problem was later found in inspection stage, a /2 is added to one of them. I am imagining: for a person stamping hundreds of pistols everyday, it's impossible that he/she never makes any mistakes over years.
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[Edit] Preventing small parts mixing in armory theory is another possibility: to prevent mixing two side plates with same number. Two pistols in a single place do not have to carry same s/n to have their side plates mixed. Side plate for 5114 is 14, side plate for 6714a is also 14. Mixing is easy. /1 and /2 solves this issue -- equivalent of assigning another digit to the side plate. Why side plate only -- Other small parts were not removed during field disassembling. 2 digit side plate was a trouble source. But why /2 was not applied to the toggle.... hard to explain.
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