An 18ct gold open-faced pocket watch English circa 1851 4.8 cm diameter, 5.5 cm high. An 18ct gold open-faced pocket watch. English circa 1851. 18 carat gold open-faced gents watch, engine turned case with central shield on back London. hallmarks for 1851 and case makers mark "HG", possibly for Horace Gooch whose mark was. entered in 1822, but he would have had to have been in work for 30 or more years. White enamel dial, black Roman hour numerals, subsidiary seconds dial. Blued steel spade. hands. Short round pendant circular bow. Fusee drive lever escapement, three-quarter back plate, not signed. Balance cock lightly. chased, diamond end stone. Movement numbered 3152. Provenance: Purchased from Hines Antiques, Moggill. Brisbane, Queensland. Dimensions: 4.8 cm diameter, 5.5 cm high