Swiss 18k gold open faced split seconds lever watch Circa 1878

Gold split seconds chronograph by Patek Philippe
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A fine and rare Swiss 18 carat gold open faced split seconds keyless lever watch, circa 1878. Nickel finished jewelled lever movement, bimetallic compensation balance. Gold cuvette. White enamel dial two eccentric subsidiary dials for constant seconds with Arabic numerals and hour/minute indication with Roman numerals, blued spade hands, outer calibrated red Arabic fifth seconds ring. Engine turned case, chronograph operated through the crown and a button in the band, coin edged band, hinged back. Case, dial and movement signed by retailer and numbered.
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Diameter: 53 mm
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Signed: Tiffany & Co Geneva