Welcome to the forum, and congratulations on your Artillery Luger.
If it's any consolation, I've seen serial number die overstamping before. I have one from Mauser in 1936.
It's possible that a factory worker picked up the wrong die, stamped the number digit, realized the error and then overstamped the correct digit.
That said, there is quite a bit of damage around the attached barrel serial number area, and the receiver sits proud of the frame, which sometimes indicates that the frame was manipulated in this area.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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