Driving the watch is the in-house automatic caliber SMA05, equipped with a tungsten micro-rotor, beating at 3 Hz and offering a power reserve of 72 hours. Through the sapphire case back, the movement reveals meticulous hand-finished details, including black-rhodium bridges decorated with Geneva stripes, and a central PVD-coated bridge framing the gear train in striking contrast.

The Openworked Tourbillon Purple Hour is offered in a limited edition, priced at CHF69,400 (approximately $87,200) for the 38-mm version and CHF 69,900 (approximately $87,800) for the 42-mm model, excluding taxes.

To learn more, visit Speake-Marin, here.