Ed's recollection is the same as mine...it may be a navy secured container for a Luger and holster (and maybe ammo also?).
Ron
P. S. Edit: It isn't exactly like the box I was thinking of. There are some detail photos, not the whole box, on page 135 of Jan Still's "Third Reich Lugers".
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If it's made after 1918...it's a reproduction
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