K date lugers have always been fascinating. Mauser's first attempt of a completely manufactured luger. It was almost like they were trying different things to "get it right". One finding not mentioned in this thread is the coming and going of the Mauser "hump" which appears to be at random throughout the K date production. I believe one of the two examples of Dick Herman's shows the hump. It's hard for me to postulate why this feature, supposedly to prevent the loss/migration of the rear receiver pin, would randomly come and go only to appear for good in late 1937 until the end of production.
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