Early Swiss 18K gold self-winding pocket watch Circa 1780

Gold open faced centre seconds lever attributed to Moyse Gevril
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An early Swiss 18 carat yellow gold open faced self-winding centre-seconds cylinder pocket watch, circa 1780.
Round-shaped plain case. White enamel dial with the motto Non plus ultra, the upper half decorated with a polychrome enamel flower garland, centre-seconds, outer radial Arabic five-minute numerals, outermost minutes/seconds track, a subsidiary dial at 6 o’clock with Roman hours and Arabic minutes, gold decorative hands. Gilded brass movement with going barrel, early self-winding, cylinder escapement with a brass wheel, gilded metal winding weight pivoted on the edge of the back plate and banking springs fixed on each side.
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Diameter: 54 mm
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Signed: No name
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Moyse Gevril (Moÿse or Gevrille) was born in 1749 in Le Locle, Switzerland and resided in Crêt Vaillant near Le Locle. He was the son of Jacques Gevril. Gevril became a master watchmaker in 1784 and made self-winding pocket watches using an oscillating weight. He supplied watches to Ph. Du Bois & Fils. In the Du Bois archives, 18 watches are recorded, presumably self-winding. Moyse founded the company Moyse Gevril & Fils. The present watch was delivered to Frères Petit in Paris. Moyse Gevril died around 1791.
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Since the publication of Alfred Chapuis and Eugène Jaquet, this model of self-winding watch has been attributed to Moÿse Gevril.