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I believe that Ref 2491...

 

...is the earliest numerical reference number that Omega called "Seamaster":

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However, it was not marked on the dial.  I've seen numerous vintage ads for unmarked Seamasters. 

The Omega database shows about a dozen different Seamaster references listed as originating in 1949.  I'm sure that there were many of that group which were introduced around the same time, so it may not be possible to say which one was truly first, unless it is specified in one of Omega's two reference books.

Hope this helps,

gatorcpa

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