Swiss gold chronometer watch with Guillaume balance Circa 1908

Gold hunting cased lever pocket watch
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A very fine and rare Swiss, 18K yellow gold keyless, Chronometer pocket watch with Guillaume balance, circa 1908. Bulletin Observatoire was sold on July 5th 1910. Accompanied by the Extract from the Archives. White enamel dial with black Breguet numerals, outer minute track, subsidiary seconds dial. Blued steel Breguet hands.
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A rhodium-plated movement, Geneva striping decoration, 21 jewels, wolf’s tooth winding, straight-line counterpoised lever escapement, Anibal-brass Guillaume balance with winged arms, gold temperature adjustment screws and platinum mean time screws, blued steel Breguet balance spring with an inner and outer terminal curve, swan-neck micrometre regulator with index. Dial, case and movement signed.
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Diameter: 50 mm
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Signed: Patek, Philippe & Cie.  Genève