Vintage Seamaster Authentication & ID - No Serial #

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I need help ID'ing a Vintage Seamaster I recently inherited. I can't find an ID on the watch anywhere and the "Hong Kong" marking on the bracelet has me worried it isn't Authentic! (although it could just be a secondary bracelet) Hoping I could get some guidance here.
 
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The Hong Kong is just on the twist-o-flex crappy bracelet, which is aftermarket and belongs in the bin. The watch is a real Omega, put it on a nice strap or something and it’ll look better and be more comfortable.
 
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And it’s filthy. Likely needs a service and certainly a crystal polish/new crystal.

Ultimately, a nice inheritance. Enjoy.
 
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The identifying information is inside. Serial number on the movement, reference number inside the case-back.