The non-concentric ring mags start showing up in the low to mid range of 1908 Nay guns. There doesn't seem to be any rhyme or reason to their appearance as concentric rings are also intermixed in the same serial number range. A plausable theory is that they were pulled out of stock that was made for the Army to relieve a production shortfall or two.
In any event, I have examples of concentric ring mags on Navy guns dated 1917 and non-concentric with guns produced well before 1914.
Kinda reminds me of the property mark conundrum.
Tom A
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