Jerry,
The (Cal. 9mm) marked mags were to show the caliber of the Luger, so that someone wouldn't load it with 30 Luger rounds. The 9mm round was still new for the M1902 and M1906. There is no difference in the mag, other than the stamp. The GERMANY stamp on your mag is an export stamp for english speaking countries. PJ's question is about the mags that were sold in Germany.
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Mike C.
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