9/1/17 - This is an original 1935 production G date Luger magazine. The base of the magazine is stamped with a serial number "5163 a" "+" sign and a B/90 proof stamp. The B/90 proof is specific to K or G Date Lugers, and thse magazines are very hard to find. Since there is a letter suffix, we know this is for an early G Date Luger. K Date Lugers didn't have a letter suffix. This rare magazine is in excellent condition with no rust or pitting, and is fully functional. Guaranteed original.