Luke,
The late Pat Redmond had a lot of information on the Navy Lugers and he indicated that the standard base magazine with the Navy type markings came into use in 1917. I don't think he ever determined if the use of the concentric ring magazine ever went out entirely. Navy Lugers with the original matching numbered magazine are rare. I have a friend that has around 10 Navy Lugers that he has bought over the past 25 years, and only one pistol has a matching numbered magazine. Most were bought before boosting became common place.
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