Fine Swiss silver open faced keyless pocket watch Circa 1890

Silver lever in original Morocco fitted box
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A very fine and rare Swiss, silver, open faced, keyless pocket watch, circa 1890. With stem winding invented by O. Courvoisier, English patent. Accompanied by the original Patek Philippe Morocco fitted box, original Certificat d’Origine, spare crystal and the Extract from the Archives. Sold on May 28, 1895. A polished case, detachable top bezel. Dedicated silver cuvette. White enamel dial with radial Roman numerals, outer minute track. Blued steel spade hands. A frosted gilt movement, bar calibre, 17 jewels, Courvoisier patent winding, straight line lever escapement, cut bi metallic compensation balance, blued steel flat balance spring, and an index regulator.
Dial and cuvette signed movement and case number.
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Diameter: 53 mm
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Signed: Patek Philippe & Co  Genève
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The unusual stem winding used in this watch was invented by O. Courvoisier and has an English patent, No. 1114 of 1873. Another watch with this winding system is illustrated in Patek Philippe, Genève, by Huber & Banbery, 1993.