Tudor Black Bay GMT for ONLY WATCH (2021). 41mm in aged stainless steel case. Manufacturer automatic Caliber MT5652 with 70hrs power reserve. Integrated GMT function. Water resistance to 200m. Silicon balance spring. Master Chronometer-certified by METAS. Unique piece Offered at Only Watch 2021 auctions conducted by Christie’s on Nov 6, 2021 Estimate 4,000-8,000CHF Hammered at CHF 650’000, 80-times above the estimate