Swiss gold lever with independent center seconds Circa 1873

Gold open-faced centre seconds lever watch
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A Swiss 18-carat gold open-faced independent jump centre seconds lever pocket watch, Hallmarked Chester circa 1873. Keywind gilt bar movement with two suspended going barrels under separate bridges, plain cock with polished steel regulator, compensation balance, overcoil hairspring, club foot straight-line lever escapement, separate independent train for the centre seconds hand which jumps once each second. Off white enamel dial with Roman numerals, continuous subsidiary seconds and independent jump centre seconds, blue steel hands. Plain case, small slide in the band to start and stop the independent seconds, wound and set through the gold cuvette, dedication on the inside of the back lid. Maker’s mark SQ in a shield.
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Diameter: 52 mm
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Signed: No name
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Unusual for a Swiss independent seconds movement to be cased by Samuel Quilliam who is most noted for producing slow beat lever watches for Joseph Yates.