Swiss yellow gold and enamel keyless lever watch Circa 1920

Gold and enamel open-faced keyless lever watch
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A Swiss yellow gold and enamel open-faced keyless lever watch, circa 1920, manual winding nickel-finished lever movement.
Silvered dial, applied Arabic numerals, bezel and bow decorated with black enamel.
18k Yellow gold polished case, back with fine black enamel band to the edge, snap-on back, case, dial and movement signed.
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Diameter: 41 mm
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Signed: Audemars Piguet and Co Brassus Genève
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Audemars Piguet is a Swiss manufacturer of mechanical watches founded in 1875. Audemars Piguet began in the Vallée de Joux. Jules Louis Audemars formed a partnership with Edward Auguste Piguet. Both were previously watchmakers. Audemars created complicated blank watch movements for other manufactures to use. Piguet specialized in the final regulation of watches. They split responsibilities when they began their own company. Audemars was in charge of production and technical aspects while Piguet focused on sales and management. One of their first achievements was creating the first repeater wristwatch in 1892.