Swiss gold dress watch with split-seconds chronograph Circa 1920

Yellow gold lever made for Tiffany & Co.
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A very fine Swiss, keyless, 18K yellow gold dress watch with split-seconds chronograph, circa 1920. Extra movement Patek Philippe, Genève, made for Tiffany & Co. Accompanied by its original Patek Philippe case. A solid, polished case, curved bezel, concealed hinge, button at 11 for the split-seconds with locking bolt, button in the crown for the start/stop and return-to-zero function of the chronograph. Hinged gold cuvette.
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White enamel dial with radial Arabic numerals, outer minute track and red fifths of second divisions, subsidiary seconds. Blued steel poire hands. Extra, nickel-silver movement, Geneva striping decoration, 25 jewels, calibrated straight-line lever escapement, cut bimetallic compensation balance with 8 adjustments, blued steel Breguet balance spring with overcoil, swan-neck micrometre regulator. Dial signed Tiffany & Co., case and movement also signed Patek Philippe & Co.
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Diameter: 44 mm
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Signed: Patek Philippe  Genève