Swiss gold open faced split seconds chronograph Circa 1913

Rose gold split seconds chronograph pocket watch by Audemars Piguet
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A fine Swiss 18 carat rose gold open faced split seconds chronograph keyless lever pocket watch, circa 1913. Nickel finish lever movement, bimetallic compensation balance, swan neck regulator. Rose gold cuvette. White enamel dial, Arabic numerals, red Arabic outer calibrated 1/5th seconds ring, two sunken subsidiary dials for 30 minute register and constant seconds. Plain case, split seconds chronograph operated through the crown and a rectangular button in the band, hinged case back. Case, cuvette and movement numbered, dial and movement signed.
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Diameter: 50 mm
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Signed: Audemars Piguet & Co