3017. Tiffany & Co. An 18K gold keyless wind open face split second chronograph pocket watch Date: Circa 1890 Movement: Swiss lever, cut and compensated bi-metallic balance, wolf's tooth winding, swan neck regulation, No.5711 Dial: White, black Arabic numeral hour markers, black outer 1/5th second divisions with red Arabic numeral 5 minute markers, subsidiary seconds at 6, blued steel spade hands, centre chronograph hands Case: Polished round, monogram to back, winding crown and chronograph button at 12, split second chronograph button at 11, No.5711 Signed: Case, dial & movement Size: 47mm Weight: 86,86g