Unusual gold Swiss split-seconds lever chrono Circa 1890

Gold split-seconds Swiss lever
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An unusually small Swiss split-seconds lever chronograph in a gold open face case, circa 1890. Nickelled three-quarter plate keyless movement with going barrel. Grained steel flyback chronograph and split-seconds work visible above the plate. Plain cock with polished steel micrometer regulator, compensation balance with blue steel overcoil hairspring. Club foot lever escapement. Signed white enamel dial with flyback split center seconds chronograph, subsidiaries for thirty-minute record and seconds, Arabic numerals, blue steel hands. Plain 18-carat open face case and gold cuvette. Maker’s mark ‘Tavannes W Co.’.  Flyback chronograph button in the crown and split seconds in the band.
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Diameter: 43 mm
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Signed: Tavannes Watch Co. Chronomètre