Unusual Swiss blackened silver keyless pocket watch Circa 1886

Silver open faced lever pocket watch
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A fine Swiss, rare and unusual, blackened silver, keyless pocket watch, circa 1886. The watch was made by Patek Philippe & Co., Genève, in 1886, and was sold on September 4, 1887. The case depicts St. George and the dragon. Accompanied by the Extract from the Archives. Chased shell and scroll band and bezels, the back cover cast and chased with St. George and the dragon and the motto S. Georgivs Eqvitvm Patronvs, the interior with a scene of Christ in a ship on a rough sea and the motto Intempestate. Secvritas.
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Hinged silver cuvette. Cast and chased silver dial with foliate decoration, white enamel oval cartouches with radial Roman numerals, outer white enamel minute track. Gold Louis XVI hands. A frosted gilt movement, bar calibre, 17 jewels, wolf’s tooth winding, straight line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Cuvette signed. Case punched G.A.S.
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Diameter: 47 mm
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Signed: Patek Philippe & Co.  Genève
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The case is slightly rusted.