Swiss 18K yellow gold keyless Chronometro Gondolo Circa 1912

Gold open faced lever pocket watch 
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A very fine Swiss, large, 18K yellow gold, keyless Chronometro Gondolo pocket watch, circa 1912. Made for Gondolo & Laboriau, Relojoeiros, Rio de Janeiro. A polished case, hinged gold cuvette. 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, wolf’s tooth winding, gold wheel train, straight-line moustache lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, micrometric cam regulator. Dial, case, cuvette and movement signed.
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Diameter: 56 mm
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Signed: Patek, Philippe & Cie.  Genève