French 18K yellow gold open faced lever watch Circa 1850

Gold pocket watch by Denis
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French 18 carat yellow gold open faced keywind lever pocket watch, circa 1850. It features a mechanical movement with lever escapement. The white enamel dial displays painted Roman numerals, a minute scale, a central second hand, and Breguet style hands. It has an 18 carat yellow gold case with guilloché, a monogrammed reverse, and a fluted edge. The bowl is signed and it is accompanied by a key.
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Diameter: 47 mm
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Weight: 79 g
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Signed: Denis à Nantes