An aluminum based magazine with the E/63 inspector mark would be correct for your Luger. The serial number includes the "v" suffix letter sn "185v" if I read it correctly.
A 1939 Mauser Luger is too late for a wooden based magazine, and too early for a plastic based magazine. (I see David also just posted this...)
Your magazine looks like it could be a plated milled FXO E/37 magazine made by Haenel Schmeisser.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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