Help- legit check on this Seamaster Deville

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I'm looking to make my first vintage purchase but don't have a deep vintage knowledge set to tell if I'm getting a reasonable deal (or legitimate watch for that matter). Seller offering a manual gold/ss seamaster DeVille for ~$900 (negotiating). Listed as festuring a manual wind 601 caliber movement and serviced last month. I've messaged for additional pictures of the movement next. Any thoughts on this piece? The price?
 
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Crown is a replacement. Caseback looks overpolished. Watch seems genuine.
 
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Strap and buckle are both counterfeit.
 
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What's "fair"? I think it's in line with retail prices for casual buyers.
 
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What's "fair"? I think it's in line with retail prices for casual buyers.
Thanks, that's what I was asking