Seamaster Cosmic advice

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Hello guys.

Today i found this watch. Exept of the crown i didn‘t notice any od things. I would Like to restore this piece. Is there a 500 caliber in it?
He is asking for 400€

 
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Likely a 552.

The bracelet is wrong and the dial looks like it could be in poor shape. I don’t think it’s a great buy at €400