Part of its Rotonde de Cartier collection, the all-new Masse Mystérieuse is a world first. It boasts a 435-part automatic movement, caliber 9801MC, that is entirely built into the oscillating weight that powers the watch. The 43.5mm case is crafted in platinum, and a sapphire crystal and caseback allow for crystal-clear viewing of the mind-boggling mechanics. Just 30 individually numbered pieces will ever be made.
Approx. $276,000, available at Cartier in Hudson Yards, New York, +1 646 495 0455, cartier.com