77
Ref. 1831, inside case back stamped 1850
An incredibly rare, important and heavy platinum and diamond-set tonneau-shaped calendar wristwatch with sweep center seconds, light blue dial and bracelet, numbered 001
Circa 1977
37mm Diameter
Case, dial, movement and bracelet signed
Estimate
CHF140,000 - 280,000
€127,000-253,000
$153,000-306,000
Sold for CHF289,800