6/10/19 - This is an original K Date Luger magazine. Actually because of the serial number, this technically could work for an early G Date as well. The base is B/90 proof stamped. Very good condition overall with minimal wear. Nice age patina on the body, but no corrosion, pitting or rust. Small dimple near the base but does not affect the operation. Excellent, strong spring. The base is serial numbered "1901" with an "a" letter suffix, and B/90 proof. There are a few pock marks in the base. The "a" suffix indicates this is right around the time K date production stopped and G Date started. Very rare and collectible magazine.