Tom,
I have a great deal of respect for both you and Nico Van Gijn, but I have to say that the explanation that the concentric ring mags were "introduced to differentiate 9MM magazines from 7.65mm by a method that could be detected in the dark" seems a bit odd. There is no difference between 9mm and 7.65 magazines, and Navy Lugers were not made in 7.65mm. It might be useful if one were in possession of a pocket full of magazines, some loaded with 9mm and some loaded with 7.65mm. But that is a somewhat of a stretch to make the point, and the same function could be accomplished by running your thumb over the top round in the magazine.
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If it's made after 1918...it's a reproduction
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