Lever watch in a gold agate set open faced case Circa 1900

Agate and gold watch
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A Swiss lever in gold set agate open-faced case, circa 1900. Gilt three-quarter plate keyless movement with going barrel. Plain cock with polished steel micrometer regulator, compensation balance with blue steel overcoil hairspring. Club foot lever escapement. Signed white enamel dial with subsidiary seconds, Arabic numerals and pierced gilt hands. The body of the open face case formed from a solid piece of polished agate carved out to house the movement. Gold screw bezel, pendant and bow.
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Diameter: 50 mm
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Signed: Zenith Brevet