A mid 19th Century Swiss centre seconds duplex in a silver open face case made for the Chinese market. Keywind gilt bar movement with matted 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 single teeth duplex escape wheel. White enamel dial with slender Roman numerals, centre seconds, blue steel hands. Engine turned silver open face case, vacant shield shaped cartouche on the back. Wound and set through the sprung glazed cuvette, silver oval pendant and bow.