Swiss gold Chronometro Gondolo pocket watch Circa 1903

Gold watch made for Gondolo & Labouriau
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A Swiss 18 carat pink gold keyless Chronometer Gondolo pocket watch with chronograph, circa 1903. Made for Gondolo & Labouriau, Relojoeiros, Rio de Janeiro. The cuvette is engraved in taille-douce with the mention Chronometro gondolo / Fabricado expressamente para Gondolo & Labouriau Relojoeiros / Rio-de-Janeiro. White enamel dial with radial Roman numerals, outer minute track with five minute Arabic markers, sunk subsidiary seconds and gold spade hands. Gilt brass movement, patented bridge calibre, 21 jewels, gold wheel train, straight line lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, with terminal curve, patented index regulator with swanneck spring and micrometric screw. Dial, case and movement signed.
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Diameter: 57 mm
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Signed: Patek, Philippe & Cie.  Genève
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Accompanied by the original box with the original main spring and an extract from the archives.
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Movement based on the French invention patent No. 142 376, delivered on April 16, 1881, to Jean-Adrien Philippe (1815-1894), Geneva, for a “régulateur de precision” (precision-regulating device for fast / slow by means of an eccentric snail). Movement also based on the Swiss invention patent No. 2 680, delivered on September 27 1890, to Patek, Philippe & Cie, Geneva, for a “Remontoir avec mise à l’heure perfectionné” (the definitive version of the keyless-winding and setting device), and, on the US design patent No. 20 483, delivered on January 13, 1891, to Adrien Philippe, Geneva, for a “Watch bridges for Watch-Movements”.