Belgian rare silver pocket watch with erotic scene Circa 1780

Silver key wind verge watch 
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A rare Belgian silver pocket watch made by J. Deville in Liège, circa 1770-1790. This watch features a key wound mechanical movement with verge escapement. The signed white enamel dial displays painted Arabic hour numerals, outer minute divisions, a winding square at two o’clock and gilt pomme hands. The silver case is finely engraved on the back with a humorous erotic scene showing a dirigible balloon launch and three gentlemen looking through the bezel at a naughty scene of two couples on a low wall. A chain with key is included.
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Diameter: 52 mm
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Weight: 108 g
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Signed: J. Deville à Liège