4. Audemars Piguet Royal Oak Concept Supersonnerie
Must see: One of only two in existence, the titanium case Supersonnerie is a sight to behold. Openworked dial and blackened bridges are its most distinctive aesthetic elements, but it's the acoustic prowess that blows the mind: the minute repeater chime can be easily heard, as it's some 10 times louder than a typical chiming watch. Much like stringed instruments, gongs are attached to a purpose-built copper-alloy plate “sound board” positioned between the movement and the mainplate. This is further enhanced by a silent striking regulator built into the movement that blocks any interference noise from the governor, the mechanism that triggers the strike. Price: $534,000.
Bonus: Step into the special acoustic lab and receive a live demonstration of the Supersonnerie from an Audemars Piguet craftsman, who will present side-by-side comparisons, not to mention a brief history, on the brand’s past minute repeaters.
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