In my opinion, 2250 is really expensive.
I'd only pay that sort of money for a near-NOS, one-owner watch—and it would be a Constellation, not a Seamaster.
Anyway, the case has clearly been polished, although not terribly. It's not in NOS condition. Also, I'm not an expert in this reference, but it seems to me like the crown may have been replaced. If you can get a shot of the logo on it, then we will be able to tell.
Do you know if the box and papers are a definite match to the watch? Is that photo of the papers the only information given? Even if the seller is reputable, there's still a chance that the papers aren't a match as some sellers purchase blank papers online and then fill them out with the pertinent information. Your seller may even have duped. Most, as far as I know, don't place a premium on papers unless there's something objectively reassuring about their authenticity.
This watch probably has a 562 or a 565 movement, and parts for those are still pretty plentiful. Servicing shouldn't be a concern—it's a fairly simple automatic, and the only real complexity might be the opening of the reversing wheel.
Finally, most collectors will find it a dealbreaker to not be able to see the inside of the watch until after purchase. After all, you should be able to check the serial movement number with the caseback reference stamping to see if the periods of production match up.
I wouldn't buy this.
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