Case Identification

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I was wondering if anyone can provide any information on this case. I tried looking up the reference numbers on the caseback and the only results that showed up were for an Omega Marine but that doesn't make sense.

Here are the pictures:
 
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Why do you think this is an Omega case? I can´t find any hint for this... and the odd serial# on the outside of the caseback???
 
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I too suspect it is not an Omega.
From the patina and vibe, possibly from the WWII era( at a guess). I've seen a case and numbered caseback like that before, but I can't remember. Lemania perhaps ? ..others will know more..
 
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Searching the U.S. patent give you a sliding case that Omega used in the 1930's, so at the very least, they have used this case company before.

Edit: You eluded to that in your original post, sorry. So here's some pretty pictures.