Swiss pocket watch with early keyless-winding system Circa 1860

Gold hunting cased pocket watch by Patek Philippe & Co.
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A rare Swiss early pocket watch with a keyless-winding system and time-setting patented invention, circa 1860-1865.
Round-shaped 18-carat yellow gold hunting case with hinged case back. The cover is engraved in taille-douce with a coat-of-arms, and the case back is engraved in taille-douce with the cypher M P E. Engraved cuvette (dome) with the mention Invention et Exécution de Patek, Philippe & Co. (invention and making). Enamel dial with Roman radial hours, outer minutes track, subsidiary dial for the seconds at 7:20, and spade hands. Keyless-winding, gilded brass movement with going barrel, cylinder escapement, monometallic balance and blued steel flat hairspring; patented keyless-winding and time-setting system. Accompanied by the original fitted box.
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Diameter: 47 mm
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Signed: Invention et Exécution de Patek, Philippe & Co.
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The engraved cuvette with the mention “Invention et Exécution de Patek, Philippe & Co.” (invention and making), is a referral to the French Patent, No. 1 317, registered in Paris on April 22, 1845 by Jean-Adrien Philippe (1815–1894); this invention was described by his inventor as “un système ou disposition mécanique de remontoir et de mise à l’heure des montres par le pendant, disposition qui peut être appliquée à toute espèce de montres ordinaires, à répétition, de marine, et même aux montres à secondes indépendantes” (a system or mechanism for winding and setting watches by the pendant, which can be applied to all types of ordinary watches, with repeater, deck chronometers, and even for watches with independent seconds).