French silver verge watch with an enamel Portrait Circa 1800

French enamel verge pocket watch
–
A French verge in a silver case with a nice polychrome enamel portrait in the front, circa 1800. Full plate gilt fusee movement. Finely pierced and engraved bridge cock with steel coqueret, square baluster pillars, plain three-arm gilt balance with blue steel spiral hairspring. Silver regulator dial with brass indicator. Wound through the signed white enamel dial, Roman numerals, gilt hands. Also, enamel on the back and on the inside.
–
Diameter 49 mm
–
Signed: Berthoud a Paris
–
A very unusual watch, movement made by Berthoud.
–
Reference 05000