Fine and rare Swiss 18 carat gold keyless chronometer Circa 1910

Yellow gold keyless pocket chronometer
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A fine and rare 18 carat yellow gold, keyless pocket chronometer with spring detent escapement. Made by Zenith Circa 1910.
Four-body, bassine et filet and polished case. Hinged gold cuvette. Three-piece, white enamel dial with Arabic numerals, outer minute divisions and subsidiary seconds. Blued steel spade hands.
Rhodium plated movement jewelled to the centre with Earnshaw type detent chronometer escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with overrcoil and a micrometre regulator.
Dial, case and movement signed.
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Diameter: 51 mm
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Signed: Zenith