Swiss 18k gold hunting cased lever chronograph Circa 1916

Gold chronograph with register by Patek Philippe
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An extremely fine and very rare Swiss 18 carat gold hunting cased keyless lever chronograph pocket watch with instantaneous 30 minute register, circa 1916. Sold on January 31st, 1931. Rhodium plated movement, Geneva striping decoration, 25 jewels, straight-line moustache lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, Wilmot’s patent micrometor regulator, chronograph mechanism on the back plate. Gold hinged cuvette. White enamel dial with Breguet numerals, outer minute and fifths of a seconds track, Arabic five minute/seconds numerals, 30 minute register at 3 o’clock, subsidiary seconds at 9 and original blued steel Breguet hands. Polished case. Dial, case, cuvette and movement signed, case signed. Accompanied by the original fitted wooden box and the Extract from the Archives.
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Diameter: 52 mm
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Signed: Patek, Philippe & Cie Genève
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The Extract from the Archives states that this watch originally had a dial with Roman numerals when it was made in 1916. However, the watch was not sold until 1931 and the buyer asked Patek Phillipe to fit the watch with its present, very beautiful, dial with Breguet numerals, though the transformation was not recorded at the time.