A mid 19th Century Swiss centre seconds Chinese duplex in a silver open face case. Keywind gilt bar movement with richly engraved plate, bridges and suspended going barrel, polished steel regulator, blue steel stop work and screws. Polished steel three arm balance with three blue steel affixes, spiral hairspring. Steel crab tooth duplex escape wheel allowing the hand to beat seconds. Fully restored white enamel dial with Roman numerals, centre seconds, gilt seconds hand, blue steel hands. Engine turned silver open face case, sprung glazed cuvette, silver oval pendant and bow.