Help with identifying a model

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Hi Everyone,

I'm new to the board with this being my first post. I've been looking for a vintage Omega for years, notably something from the Seamaster line. Tonight while looking at the history of Omega from the website I found a watch that I'm pretty enamored with - see the image. Wondering if anyone can provide details on either model and by chance, how hard would it be to source one of these?

Any help is greatly appreciated!
E.
 
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If you like sub second dials you’re looking for reference 2576. If you prefer centre seconds you’re looking for 2577. Here’s my 2576: