raimo,
It looks like you measured the bore from groove to groove. If you measure it from land to land, you will come up with the actual caliber. Your Luger is as Doubs described, one of the last 5 digit commercial Lugers and it is a 7.65mm caliber. The registration for the Luger is incorrect. It is not a 1918, but a post WWI commercial in very nice condition. In additon to the "SAFE" marking, the extractor should be marked "LOADED". This is not a super rare variation, but it is uncommon and is definately a collectable and not a shooter, particularly in this condition.
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If it's made after 1918...it's a reproduction
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