Swiss gold-filled single piece agate stone pocket watch Circa 1930

Gold- filled open faced lever
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A Swiss agate and gold-filled keyless pocket watch, circa 1930. Formed from a single piece of black agate with white bands, a gold-filled polished bezel. White dial with Roman numerals, outer minute track, subsidiary seconds and blue steel spade hands. Rhodium-plated movement, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring regulator.
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Thickness: 15.5 mm
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Diameter: 50 mm
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Signed: No name