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Although your gun's numbers all seem to be the same, your gun is a mismatch, as Erfurt produced no Lugers after 1918. A clear photo of the front of your frame would help considerably, as this would tell us if the frame is Erfurt. The area just above the trigger guard seems very odd in profile and may have been ground down or otherwise modified. Please also photograph the proofs on the pistol's right side just behind the barrel. The "K I" above the chamber date is interesting and members with knowledge of this marking will, I'm sure, comment on this.
Your holster looks like a Police model, which has been modified back into a military configuration, which may give a clue as to the pistol's origin. Photos of all the markings on the holster would also help in supplying you with more information.
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