After a decade I would be concerned about the oil drying etc ..... so a service would probably be in order, but since there should be no actual wear on the parts I wouldn’t call it a bad deal. Depends on the price of the watch, the discount for being NOS and the cost of the service. Also I would consider if it’s a watch I intended to keep a long time and how much I’d wear it and if nothing similar was in production anymore.
Modern lubricants do not dry out, so, unlike others above, I would have absolutely no concerns since I assume (and this is the key part) the seller has tested it see if it were both running and accurate--if so, it should be fine just as it is, with no need of immediate servicing. I do, however, consider all "NOS" in the same class as used, and whenever I buy used, I do assume that it MAY need servicing, and factor that cost into the total of what I would be willing to pay for the watch--I would NOT, however, get it serviced immediately simply because it is 10 years old, but only if it were not running smoothly, consistently and accurately--pretty much the same criteria I use for determining when to service any watch.
One thing that hasn't been mentioned yet are gaskets/seals. For all you know, some seals may have already failed, especially if lubricant has pooled in area after sitting for a long while (regardless of breaking down or not.)
I would have the watch pressure tested and checked for accuracy. If it passes, consider a service in the near future (within a year or so) rather than a normal service interval of ~5 years from purchase.
As Jaco Pastorius would say, "Fret not."
It may need a little lube up, but if it has just been sitting in it's dark box for 10 years, it is probably fine. Keep an eye on it and if the accuracy is way off, then hopefully a mild service.
I would be sceptical that a watch so valuable would sit around unused and unsold for 10 years. I just don’t see it. A grey market dealer bought it and could t shift it for 10 years? Surely he would drop the price to sell it at some point in that period.
I’d treat it as used, and I’d also be wary that it may be a used watch that has received some amount of polishing by someone other than the manufacturer. I would inspect it closely, ask why it hadn’t been used or sold in the last 10 years, and factor in a service as it if was used.
You do get cases where some watch parts have been stored away somewhere for a decade by someone who forgot about them, but a whole watch? I’m sceptical.
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