Swiss 18K gold pocket watch with split-seconds chronograph Circa 1915

Gold minute repeating lever
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A very fine and rare Swiss, minute repeating, keyless, 18K yellow gold pocket watch with split-seconds chronograph and progressive 30-minute register, circa 1915. A solid, polished case, hinged gold cuvette. Silver dial with applied radial yellow gold Arabic numerals and pyramid indexes, outer 1/5th seconds track with 5-minute/seconds Arabic markers, subsidiary dials for the seconds and progressive 30-minute register. Yellow gold baton hands.
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A rhodium-plated movement, Geneva striping decoration, 23 jewels, 8 adjustments, straight-line lever escapement, cut bimetallic compensation balance adjusted to three positions, blued steel Breguet balance spring, swan-neck micrometre regulator, repeating on gongs activated by a slide on the band. Dial, case and movement signed.
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Thickness: 11 mm
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Diameter: 49 mm
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Signed: Audemars Piguet & Co (Retailed by Cartier) Geneva