Hmm it has the old Omega stamp, possibly of French origina, and was purchased in 49 according to the inscription on the case back. However a 14 million serial number would date this movement to around 1954, so we know its at least slightly Franken. Movement doesn't look like a 28.10 but a cal 351. Also the case is not a Seamaster case, unless its a very over-polished 2989. Its looking evermore Franken to me.
Cheers
Desmond
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