Omega cal.511 dress watch

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Hi guys i need help with this omega. I think it’s a 14387 and should have a cal. 520. The case seems to be in a nice condition and the crown is signed but i dont know about the hands and the dial. Its missing a seconds hand and the hands are probably not original. What i have most doubt about is the dial though, i haven’t seen that kind of dial with gold/copper indexes (or maybe its just the light)
 
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I believe it is a reference 14371, caliber 511.

Dial and hands look fine based on the provided photo.
 
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The Omega with 511 movement's not missing a second hand for it didn't come with a second hand.
 
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I also got a photo of a movement now, like you guys said it’s a cal. 511 and doing research i found it’s a rare one, do you think it’s worth 400$?