7/26/17 - This is an original WW2 era production Mauser Luger magazine. This magazine is an unusual variation, with eagle/37 military proof stamps on both the frame and base of the magazine. There are two eagl/37 proofs, along with a "122" code on the left side of the frame. The base is stamped with one eagle/37 proof and a serial number. The base and serial number look like they were ground down slightly or someone might have tried to alter the base, but then gave up. This is because the numbering looks all original and authentic, but there is some uneveness to the base. The three digit serial is correct for this variation, along with the plus sign. The magazine frame has minimal wear, with no rust or pitting and the spring is fully functional. Guaranteed original.