Chas, The Crown/N marking is a commerical proof, so it's possible that your luger is a 7.65mm. I'd check that before attempting to shoot your 9mm ammo. I'd also check the ammo head stamps, since if it's as old as the pistol, it may have some collector value. When measuring the barrel, it should include the chamber area, so measure from the front of the muzzle all the way back to the extractor groove at the back of the chamber. TH
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