German silver verge with tortoiseshell outer case Circa 1780

Silver pair cased pocket watch
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A rare Southern German pair cased verge pocket watch with painted tortoiseshell outer case, circa 1780.
The outer case is a silver/brass, tortoiseshell covered, stud decoration around the edges. The inner case is also silver and florally engraved on the back side.
Enamel dial, roman numerals, full plate movement, chain/fusee, three-arm brass balance.
The tortoiseshell outer case is decorated with a painted alpine landscape scene: a miller leads a donkey loaded up with sacks of grain along a stream to the mill, a rare genre scene filled with brilliant colour.
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Diameter: 59 mm
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Weight: 131 g
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Signed:  Johann Riel   Stadtamhof