Stolen watch, really?
If you look a the seller in question he is clearly NOT a vintage watch seller, he's a pawn broker, selling on eBay since1999 with 100% feedback.
He could easily have turned the rotor to cover the serial number, but instead he posted lots of large clear photos of the watch so the bidders on this no reserve auction could make up their minds.
As for the serial number, watchmakers have been known to do some inexplicable things, which is what I suspect has happened here. Remember these things we now covet were once simply watches, given no special reverence or significance during their previous lives. The defacing of the number was clearly done quite some time ago, otherwise you would see bright shiny metal, and actually I bet if you had the watch in hand you could make out the number.
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