I would say that they are M2 not navy Lugers. I know that some of the navy holsters with the attached shoulder strap were made for the 120mm barrel length (I have one) so I do believe that some portion of the 1908 M2 Lugers were transferred to the Navy for marine/ground assault units. Just my opinion, no documented evidence other than photos and holsters.
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If it's made after 1918...it's a reproduction
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