Fine Swiss gold chronograph with register Circa 1907

Yellow gold open faced keyless monopusher chronograph watch
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A fine and rare Swiss 18k yellow gold open faced keyless monopusher chronograph watch with 30 minute register, Chronometro Gondolo, circa 1907.
Brass gilt moustache lever movement, cut bimetallic balance with peripheral timing screws and blued Breguet balance spring with terminal curve, François Wilmot’s micrometric cam regulation system, gold wheel train, numbered gold cuvette.
White enamel dial, Roman numerals, subsidiary dials for constant seconds and 30-minute register, gold pear hands, outer minute track with 1/5 seconds divisions, bassine engine-turned case, case, cuvette, dial and movement signed.
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Diameter: 57 mm
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Signed: Patek, Philippe & Cie Genève
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With a presentation case, one spare glass, one spare barrel spring and an Extract from the Archives confirming sale in 1907.

This particular model is the most complicated Gondolo pocket watch known. Today only 25 Chronograph Gondolo have been identified and only 6 like this particular example with the 30 mn register.

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 calibre 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).