Swiss independent dead beat center seconds lever Circa 1882

Rose gold half hunting cased two train lever watch by Patek Philippe
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A very fine, rare and early Swiss 18 carat rose gold half hunting cased two train independent dead beat center seconds keyless lever watch, circa 1882. Mechanical fully jewelled two train lever movement, bimetallic compensation balance. Gold cuvette. White enamel dial with Roman numerals, blued steel double Spade hands, independent dead beat center seconds and subsidiary seconds. Plain case, seconds start/stop button in the band, coat of arms monogram to the back. Case, cuvette, and movement are signed, and case and movement are numbered.
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Diameter: 51 mm
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Signed: Patek, Philippe & Co Genève