The 1954-produced Perpetual Calendar Chronograph is in incredible condition, its gold case still featuring plenty of its original polishing in addition to a matching solid gold bracelet, custom made by historic watch seller and jeweler Gobbi Milano in the 1960s. Sales estimates for the ultra-intriguing watch were naturally astronomical, with the timepiece marked between USD 871,000 and USD 1,740,000, and it did not disappoint with a realized price of CHF 1,482,000 (about USD 1,625,850).