I am a little late in responding to this topic but here is my two cents.
(1) all M1906, navies as well as the commercial navy, have the long frame.
(2) all 1908 military (navy) have long frames.
(3) the 1908 COMMERCIAL navy may have long or short frames. See page 211 of John Walters book, The Luger Book. He states that "there were a handful of short frame navy commercials in the 56747-58634 group without grip safeties.". I have physically held only one.
(4) all M1914 navies have the short frame.
Big Norm
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