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. White enamel dial with Roman numerals, centre seconds, blue steel hands. Plain silver open face case, sprung gilt cuvette, silver oval pendant and bow.