Ron, the only thing I have ever seen on a 7.65 Navy is a post on Jan Still's forum on 9/17/2003 under "Commercial/Foreign Contract" showing a 1902 Carbine with a Navy acceptance mark. This carbine seems to have been a presentation prize for fencing tournament.
Kenyon's Lugers at Random shows a 1906 commercial Navy 9mm with the concentric rins and notes it is marked 9mm on the bottom. I have been under the impression these ringed and 9 mm marked mags were commercials. I note in Mr Van Gjyn's post he refers to the magazine drawings as 1904 7.65 and 9mm and 1906 7.65 and 9 mm without a navy designation for the blueprint. Perhaps he is making an assumption here.
My hypothesis is the ring may relate to getting a better grip on the mag bottom in wet conditions. How tight do Navy mags fit in their pouches?
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