Swiss gold Chronometro Gondolo pocket watch Circa 1906

Gold watch made for Gondolo & Labouriau
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A very fine Swiss, 18 carat yellow gold keyless Chronometer Gondolo pocket watch, circa 1906. Especially made for Gondolo & Labouriau, Relojoeiros, Rio de Janeiro. A solid case, guilloché engine turned caseback, hinged case back. White enamel dial with radial Roman numerals, outer minute track with five minute Arabic markers, sunk subsidiary seconds at 6 and gold spade hands. A frosted gilt brass movement, with going barrel, train of gold wheels, straight line equilibrated lever escapement, à moustaches, compensated balance with gold poising screws and blued steel hairspring with terminal curve, patented index regulator with swanneck spring and micrometric screw. Dial, case and movement are 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, certificate and extract from the archives.
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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”.