Help about buying Omega

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Hello,
I've found one vintage omega and I have doubts about the authenticity of the watch. I'm posting some pictures from the ad. I can't find anywhere this particular model with this dial (ad saying it's seamaster, whether dial is geneve, and dials with 3-6-9-12 numbers corresponds only with the similar Omega with date function), but the movement looks like authentic one. Bracelet is not the original one (thinking about NATO strap).
Price is about 360 usd.

Thanks in advance,
Nikola
 
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Geneve marked dial with the Seamaster back is fine for this reference.
 
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The case has seen the heavy handed use of a buffing wheel.