Selling for more than $7 million at the Only Watch Geneva in 2015, this steel-cased Patek Philippe combines three elite horological complications: a minute repeater, a tourbillon, and a perpetual calendar with moon-phase. Driven by a 506-part manually wound movement, the watch also features a retrograde date hand that flies back to the beginning of the next month after every 28, 29, 30, or 31 days. Mounted on a dark blue alligator strap, this watch is also desirable for its understated size — just under 37mm in diameter despite its ultra-complex inner mechanism.
