ID on vintage omega automatic with subseconds

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I found this watch online but the seller hasn't provided a ref or anything. I can't get a movement shot until next week but does the dial look fine? Thanks!

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Probably a caliber 490, mid 1950s.

I think the dial is OK.
 
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Funny when people take photos with the crown pulled out.
 
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Thanks for the input. The case is a bit rough but I think I can accept it.
 
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Would a seamaster have any markings on the back? I don't see any
 
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Funny when people take photos with the crown pulled out.

Maybe they struggle for a long time to take a pictures and from my knowledge a professional pictures on a watch has the hour and minutes hands set to 10 and 2..😀
 
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Would a seamaster have any markings on the back? I don't see any
Not necessarily. For the first few years there was no identification at all on the outside.
gatorcpa
 
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Funny when people take photos with the crown pulled out.

I think they do it to set the hands at 1350 and forget to push the crown back in. Then when they see the crown out in the pics they can't be bothered to take more.
 
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So the caseback has 2576-4 and it's a cal 342. I looked up this reference and I don't think the dial matches at all?

edit: looks like 2576-4 refers to the case model?
Edited:
 
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With this new information the dial appears to be a much later service dial. Dials were often replaced at the time of service to replace one which had become damaged. The current dial appears to be from the late 50s or 1960s.
 
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What is the buy value that would be placed on this type of Omega?
$600-700?
 
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Interested as well.

So the service dial is still authentic Omega then?