You're most likely looking at a "X" that was marked when this was captured by the Russians.
The Erfurt proof marks are crowns over a Fraktur letter.
All Erfurts were military guns since they were made by the Imperial Arsenal under license from DWM.
There should have been a date on the original receiver.
Depending on condition, if priced as a mid to lower range shooter (refinished ? dipped ? ) it could be worth looking at.
If your looking for a collectable gun, you'll have to post some pictures to get a more accurate analysis here.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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