It's not uncommon to see anomalies in the stamped markings on these pistols. I have one from 1936 with an overstamped first serial number digit that is factory. An inattentive technician picked up the wrong die (the second digit's die) then overstamped it with the correct first digit. This passed inspection.
Check the inside of the trigger plate to see if it is blank, has "20" stamped inside or "21" stamped inside.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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