Greubel Forsey Nano Foudroyante (2025)

Greubel Forsey Nano Foudroyante, 2025. Case is in 18k white gold, size is ø 37.90 mm, thickness is 14.34 mm, water resistant to 30 m, with sapphire crystal (high-domed) and a transparent caseback. Calibre number is not stated on the GPHG listing; movement is manual-winding mechanical, running at 21,600 vph (3 Hz), featuring a flying tourbillon with the Nano Foudroyante mechanism, and it indicates hours, minutes, seconds, tourbillon, and a flyback chronograph, and the power reserve is 40 hours. Limited quantity is not stated on the GPHG listing (it is described as an official limited edition). Priced at CHF 502,200 (incl. VAT). This watch is the winner of the 2025 GPHG Mechanical Exception Watch Prize.