Those marks on the rear right "ear" of the receiver are most likely machining marks. Your pistol was made in 1942, and toward the last of the Lugers made by Mauser. At this point, the factory must have been pushing out as many as they could, and the inspectors might have been less discerning... The sharpness of those marks (and other edges) help confirm that it was not refinished...
The other wear marks on the front edge of the left ear are interesting, especially when seen with the imbalance of wear in the two marks on the back of the receiver. It looks like the toggle really dug into the receiver ear. Something appears imbalanced.
One of the more capable Luger gunsmiths might be able to help understand why that occurred. It would be good to closely inspect everything about the receiver and toggle assembly fit.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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