Gold 18K Swiss chronograph watch with registers Circa 1906

Gold Swiss chronograph watch with registers
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An 18k pink gold Swiss open-faced keyless lever chronograph watch with registers, circa 1906, chronometro gondolo, cal. 21” gilt lever movement, signed and numberedgold cuvette.
White enamel dial, Roman numerals, subsidiary dials for constant seconds and 30-minute register, outer track calibrated for chronograph, engine-turned case, case, dial and movement signed, Extract from the Archives confirming sale in 1907.
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Diameter: 56 mm
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Signed: Patek Philippe
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Chronometro Gondolo watches were made especially for the retailer Gondolo & Labouriau in Rio de Janeiro who were important retailers from the 1870s. From 1902 Patek Philippe produced exclusively for Gondolo & Labouriau a specially designed very high quality caliber called “Chronometro Gondolo”. Its specification required the ebauche to be based on Adrien Philippe’s patented design (US patent No. 20483 of Jan 13, 1891) with the so called “moustache” lever escapement, cut bimetallic balance and also François Wilmot’s patented micrometric cam regulator (US patent No 129197 registered on July 16, 1872).