It's difficult to make out any detail in your photo of the right side of the receiver.
The three markings toward the front of the Luger are the inspection marks and proof. E/63 was one of the inspectors that was active in 1938.
The other letters are an import mark applied when the gun was brought into the USA.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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