French 20K gold quarter repeating à toc pocket watch Circa 1780

Gold open faced verge pocket watch
–
A very fine French 20K gold and en enamel open faced quarter repeating à toc verge pocket watch, circa 1780. A Louis XVI case, the back with a classical en grisaille scene highlighted with gold paillons, translucent royal blue background over sunray engine-turning, gold paillon border, the bezel decorated to match. White enamel dial, radial Roman numerals, outer minute divisions with Arabic five-minute numerals, winding aperture at 2 and gold beetle hands. A hinged frosted gilt full plate movement with cylindrical pillars, fusee and chain, verge escapement, brass balance with flat balance spring, continental cock with polished steel endplate, silver regulation disc, repeating on the inside of the case activated by depressing the pendant.
Dial and movement signed. 
–
Diameter: 42 mm
–
Signed: Vaucher Paris
–
The dial is slightly chipped.
–
Daniel Vaucher was made master in 1767, listed as working in Paris at Rue St. Pierre aux Boeufs from 1769-1790.
–
A grisaille (en grisaille), or grey painting, is a painting in which one does not apply natural colours but restricts oneself to depicting things in all possible shades of the same colour, usually grey or brown.