Welcome to the Forum.
It would help to see more of the Luger. Search for our FAQ and look for other posts of VoPo Lugers on the site. I have previously posted photos of known Vopo Lugers and I think that the mark might be similar. It looks like a double strike, and I can't make out much detail from your posted picture.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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