315
An extremely rare and historically important stainless steel tourbillon openface watch with one minute tourbillon regulator awarded the first prize at the Geneva Astronomical Observatory for the timing contest on February 3, 1931 with two zone sector dial, additional yellow gold case, dial, hands and fitted presentation box
1924
57 mm. diameter steel case, 60 mm. diameter gold case
Case, dial and movement signed
Estimate
HK$3,900,000 - 8,000,000
Sold for HK$4,840,000