Swiss 18K yellow gold open faced keyless lever watch Circa 1930

Gold keyless lever 
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A fine Swiss 18 carat yellow gold open faced keyless lever pocket watch made by Zenith in Le Locle, circa 1930.
It has a solid case with a reeded bezel and foliage decorated bow. The dial is matte silver with black Arabic numerals, an outer minute track, subsidiary seconds at 6 o’clock and blued steel Breguet hands.
A frosted gilt movement with a straight line lever escapement, bimetallic balance and a self compensating steel Breguet balance spring.
Dial, case and movement signed.
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Diameter: 47 mm
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Signed: Zenith 
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Zenith SA is a Swiss luxury watchmaker. The company was founded in 1865 by Georges Favre-Jacot in Le Locle in the canton of Neuchâtel and is one of the oldest continuously operating watchmakers. Favre-Jacot invented the concept of ‘in-house’ movements, believing that only through control of the entire watchmaking process perfection could be achieved. Zenith was purchased by LVMH (Louis Vuitton Moët Hennessy) in November 1999, becoming one of several brands in its watch and jewellery division which includes TAG Heuer and Hublot.