Swiss highly complicated watch with pulsometer chronograph Circa 1925

Extremely rare watch with a double glazed transport case
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An extremely rare pocket watch with a highly complicated movement with pulsometer chronograph, made by Audemars Piguet in Brassus & Genève, Switzerland, circa 1925. The open faced transport case is double glazed and the original white enamel dial with pulsometer scale has blued steel hands. The numbered precision movement of the highest class has a lever escapement, gold wheels, Geneva striping, wolf’s toothing and a fine adjusting device.
Dial and movement signed.
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Diameter: 50 mm
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Weight: 71 g
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Signed: Audemars Piguet Co, Brassus Genève