One of the biggest highlights of the Only Watch 2019 auction is F.P. Journe's Astronomic, an incredibly complex prototype timepiece that boasts eighteen complications and functions that can all be adjusted via the crown. These functions include hours, minutes, and seconds, a second timezone, sunrise and sunset, day and night indication, moon phases, a power reserve, an annual calendar, and equation of time. The 44mm case is made out a rare Tantalum metal alloy and it's fitted with an orange crocodile leather strap. Inside the case is FP's prototype 758-component manually wound movement in 18K rose gold.
$300,00-$600,000 (est.), onlywatch.com
(h/t Chad D.)