Swiss 18K rose gold open faced cylinder watch Circa 1800

Rose gold watch attributed to Moijse Gevril Fils
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A very rare Swiss 18 carat rose gold open faced cylinder pocket watch, circa 1800. Early full plate oscillating weight winding movement, a steel cylinder escapement and the engraving Par Un Mouvement Naturel (By Natural Movement). White enamel regulator dial, small radial time indication in the lower half with Roman hours, an outer minute track, Arabic five-minute numerals, polychrome enamel decoration and beetle & poker hands, another outermost minute track with Arabic five minutes, power reserve indicator at 12 o’clock with the moto Non Plus Ultrâ underneath. A plain case. Case numbered.
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Diameter: 50 mm
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Weight: 116 g
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Signed: No name
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The Swiss watchmaker and inventor Abraham-Louis Perrelet (1729-1826) was regarded as the inventor of self-winding pocket watches for a long time. However, Hubert Sarton of Paris is also known for having invented an automatic winding system with a rotor mechanism for pocket watches. Historians are still undecided here.