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As a unique piece from the Rolex / Tudor family, the Black Bay GMT One is link virtually guaranteed to bring heavy-hitting bids when it hits the Only Watch rostrum at Christie's Geneva this November. I have to link admit that I chuckled when I saw its quaint estimate on link the Only Watch site.Estimate: CHF 4,000 - 8,000

In link short it's a very complicated beast of a movement and its centerpiece complication is the link so-called Chrono Chime which is activated via a button on the case look for the one marked by a single musical note. When activated there are three audible phases that chime the minutes a low tone the seconds in 10-unit increments link a paired tone and finally the single-digit resolution of the seconds with a high tone.