Sotheby's and Christie's are usually not the best places to buy or sell [niche] items, as there are specialist dealers and auctioneers who are far more experienced. If one gets included in a Sotheby's or Christie's sale, it often sells at a fraction of the price it would fetch in the specialized market, and more rarely, for far more. It just isn't worth it for those large auction houses to fully develop the expertise in those smaller-ticket items, though they do have musical instrument departments. I don't know if that is the case with vintage watches, but I do know there is very little regulation in the auction world, so buyer and seller beware.
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