Jim,
Thanks for posting the CUs of the serial number.
It does look like this was overstamped, and it might be in a way similar to what my 1936 looks like.
In my case, they had stamped one of the digits in the wrong order, then corrected the error with an overstamp of the right digit.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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