Omega caliber reference. Help needed.

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I just bought this omega automatic and wondered if someone could confirm the caliber please. Its not in my possession yet and these are the only photos. Many thanks.
 
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Your last photo looks like a different watch? Also do you have a photo of the inside of the case back which would help the experts I imagine.
 
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Same watch. Unfortunately no photo of inside cashback. I think myself that it is a caliber 490. Hopefully someone with better knowledge will help. Thanks.
 
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Same watch. Unfortunately no photo of inside cashback. I think myself that it is a caliber 490. Hopefully someone with better knowledge will help. Thanks.
From the first 2 pictures, it also seems to me that it looks like caliber 490.
 
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Thanks. There is a caliber 490 for sale on eBay but the winder is different. It more circular.
 
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Last two digits on movement are 90 so probably 490.
 
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Thanks. Any thoughts on the winder. It looks original to me.

Are you referring to the crown? The rotor?
 
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The crown. All other 490's have a different crown plus owner states this watch is 39mm while other 490's seem to be 34mm.
 
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The crown. All other 490's have a different crown plus owner states this watch is 39mm while other 490's seem to be 34mm.

Yes, I agree with you. The crown is probably a replacement meant for a different reference, and the case is certainly not 39mm in diameter. He probably measured it wrong.