SRE,
Black plastic bottomed fxo magazines were issued to late 1941 and 1942 Lugers. So yours is not original to your 1940 gun. The other magazine with the aluminum bottom has been altered. Magazines with fxo on the body had centered pinned bottoms, like on your black plastic magazine.
The aluminum bottom is from an earlier year and has been side pinned to the fxo body.
Tom
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