Well, the serial number dates the watch to the correct period for a manual wind front loading Seamaster DeVille. It's possible the watch was assembled a year or two after the movement was made, then the dealer had it in stock for several years too. And who knows if the dealer didn't add a year or two to the warranty paperwork to buy the customer an extra year or two?
The crown is certainly a replacement but as you note that's not a big deal. I'd want to see more detailed pictures of the lugs and caseback edges because I suspect the crispness has been polished away completely.
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