Unusual gilt-metal watch with painted enamel reverse Circa 1790

Gilded open faced verge pocket watch
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Unusual Swiss gilt metal and enamel open faced verge pocket watch, circa 1790. The reverse of the case with painted enamel scene depicting two maidens in an orchard within a blue border. White enamel dial, radial Roman numerals, outer minute divisions and Arabic five-minute numerals, gilt hands. A hinged gilt-brass full plate movement with square pillars, fusee and chain, verge escapement with micrometric potence adjustment, plain brass three-arm balance, continental cock with polished steel endplate, silvered regulation dial. Movement signed by the watchmaker, dial signed Patry & Chaudoir A Genève. 
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Diameter: 52 mm
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Signed: Fres Esquivillon & Dechoudens Genève
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The case is slightly worn and the hands are partially replaced.