Swiss gold digital jump hour lever dress watch Circa 1917

Gold keyless lever with digital jump hour by Audemars, Piguet & Co 
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A very fine, rare and thin Swiss 18 carat gold open faced digital jump hour keyless lever dress watch, circa 1917. Rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring, index regulator. Gold hinged cuvette. Matte champagne-coloured dial, aperture for Arabic jump hour numerals, outer minute track with five minute Arabic numerals, subsidiary seconds and original blued steel lozenge hand. Polished case, the back with engraved Oriëntal style monogram PF. Dial, case and movement signed.
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Diameter: 43.5 mm
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Signed: Audemars, Piguet & Co Brassus & Genève