I'm inclined to believe the watch is real and not like one of the "Ukranian Specials".
I would need to inspect it in the flesh before I parted with $10K though.
If you look at his other listings and find the
Zenith boxed chronometerPurchases made through these links may earn this site a commission from the eBay Partner Network (not really a naval chronometer though!), in the picture gallery the last two are of some significant pocket watch collections.
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