Fine Swiss 18k gold chronometro gondolo watch Circa 1912

Gold hunting cased lever pocket watch
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A fine and rare Swiss, 18K gold, keyless, hunting cased Chronometro Gondolo pocket watch, circa 1912. Made for Gondolo & Labouriau, Relojoeiros, Rio de Janeiro. An engine-turned case with polished borders, the front cover with engraved foliate monogram. Hinged gold cuvette.
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White enamel dial with radial Roman numerals, outer minute track with five-minute Arabic numerals, subsidiary seconds. Gold spade hands. A gilt brass movement, patented bridge calibre, 21 jewels, gold 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: 48 mm
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Signed: Patek Philippe & Cie  Genève
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The dial is slightly chipped.
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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.