Patek Philippe. An 18K gold keyless wind open face pocket watch Reference: 877 Date: Circa 1980 Movement: 18-jewel, Cal.17-170 Swiss lever, Côtes de Genève finish, compensated balance, swan neck regulation, double Seal of Geneva, adjusted to heat, cold, isochronism & 5 positions, No.932432 Dial: White, black Roman numerals, black outer minute divisions with 5 minute markers, subsidiary seconds at 6, polished pointed baton hands Case: Brushed and polished round, snap on back, No.433807 Signed: Case, dial & movement Size: 47mm Accompaniments: Patek Philippe box, 18K gold chain, Patek Philippe service receipt dated 29/03/17, Christies receipt dated 1987