Swiss gold Adjusted Extra lever chronometer watch Circa 1898

Gold open faced lever pocket watch by Patek Philippe
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A very fine and rare Swiss 18 carat gold open faced keyless Adjusted Extra lever chronometer pocket watch, circa 1898. Sold on September 9, 1903. Adjusted Extra rhodium plated movement, Geneva striping decoration, 17 jewels, wolf’s tooth winding, counterpoised straight-line lever escapement, anibal-brass Guillaume balance with winged arms, gold temperature and platinum meantime adjustment screws, blued steel Breguet balance spring with outer terminal curve, swan neck micrometer regulator also with additional fixed index arm and engraved scale on the centre bridge, diamond endstone. Gold hinged cuvette. White enamel dial with Roman numerals, outer minute track and Arabic five minute numerals, subsidiary seconds dial and original blued steel spade hands. Solid, polished case, the back with engraved monogram. Dial, case, cuvette and movement signed, case and movement numbered. Accompanied by the Extract from the Archives.
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Diameter: 51 mm
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Signed: Patek, Philippe & Cie Genève
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Double regulator. The two regulator arms do not work independently but are fixed in position, the regulation is adjusted using the familiar ‘swan neck’ regulator, the other arm showing the degree of regulation. The inscription ‘Adjusted Extra’ on the bridge of the movement refers to the high finishing of all the parts of the movement.