Hi
Note the pin on your 122 code magazine. This indicates the pin has been out and the bottom changed. The C.G. Haenel magazine marked 122 and SE-37 appeared in January of 1940 with the 1940-42 Lugers. The 122 code magazine remained as "the magazine" until the very late - o - block of the 41-42 / 41-byf production. All 122 code magazine had a concave pinned aluminum base numbered to the gun. None of these 122 code magazines were original with "black plastic" bottoms. During the very late - o - block the first C.G. Haenel fxo magazine appeared. These magazines also had a concave pinned aluminum base and were numbered to the gun. They were marked with the fxo stick eagle 37 and an upside down P 08. About the - r - block of the 41-byf production the next fxo magazine appeared. This also had the fxo stick eagle 37 but the P 08 was right side up. These also had concave pinned aluminum bases (CCPA) About the same time (June of 1941) the last of the C.G Haenel "extruded" magazines appeared. These were the black plastic base magazines. About the - u - block of the 41-byf production Mauser seriously curtailed the numbering of Luger magazines. The last two mentioned magazines were common until the end of Luger production. Good Luck
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