Swiss 18K gold open faced lever pocket watch Circa 1850

Unsigned gold pocket watch with a special lever
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An interesting, early 18K gold lever watch with special lever and early crown winding, circa 1850.
Early bar movement, crown winding, specially balanced lever. Enamel dial with Roman radial hours, outer minutes track, subsidiary dial for the seconds, and blued Breguet steel hands. 18K gold engine turned case, coined band, and dome also magnificently engine turned.
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Diameter: 45 mm
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Weight: 73 g
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Signed: No name