Swiss 18k rose gold Chronometro Gondolo watch Circa 1911

Gold open faced lever pocket watch 
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A fine and rare Swiss, 18K rose gold, keyless Chronometro Gondolo pocket watch, circa 1911. Accompanied by the Extract from the Archives. Made for Gondolo & Labouriau, Relojoeiros, Rio de Janeiro, sold on May 13, 1912. Engine-turned back with polished border. Hinged gold cuvette. White enamel dial with radial Roman numerals, outer minute track with five-minute Arabic numerals, subsidiary seconds. Gold spade hands.
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A gilt brass movement, patented bridge calibre, 21 jewels, wolf’s tooth winding, gold wheel train, straight line moustache lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, Wilmot’s patented micrometric cam regulator. Dial, case, cuvette and movement signed.
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Diameter: 51,5 mm
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Signed: Patek, Philippe & Cie  Genève  Chronometro Gondolo
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Chronometro Gondolo Gondolo & Labouriau in Rio de Janeiro were important Patek Philippe retailers starting in the 1870s. From 1902 on, the company produced a specially designed, very high-quality calibre, called Chronometro Gondolo, exclusively for Gondolo & Labouriau. Its specifications required: that the ebauche be based on Adrien Philippe’s patented design US patent o. 20483 of Jan 13, 1891 – a 9K gold train – a straight line moustache lever escapement with cut bimetallic compensation balance and Breguet balance spring, a minimum of 18 jewels, François Wilmot’s patented micrometric cam regulator US patent 129197 registered on July 16, 1872.