French 18K yellow gold open faced pocket watch Circa 1850

Gold key wound cylinder watch
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A French 18 carat yellow gold open faced pocket watch, circa 1850. It has a mechanical movement with key winding, a cylinder escapement, and an advance/delay setting, featuring double winding squares. The white enamel dial displays Roman numerals for the hours, an outer railway minute track with red Arabic five minute numerals, cracks, and arrow hands. The round case is hinged with a guilloché back and a gold bowl.
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Diameter: 43.5 mm
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Weight: 55.5 g
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Signed: No name