French 18 Carat gold independent seconds ruby cylinder Circa 1840

Gold open faced cylinder watch
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A French 18 Carat gold open faced independent seconds ruby cylinder pocket watch, circa 1840. Keywind gilt Lépine caliber movement, two suspended going barrels with polished Geneva stop work, plain cock, blue steel regulator with temperature compensation curb, polished steel parachute suspension for the top balance pivot, plain three armed gilt balance with blue steel spiral hairspring, ruby cylinder escapement and steel escape wheel, separate independent train for the center seconds hand which jumps once each second. Attractive gold dial with Roman numerals,  engraved center and outer border, independent centre seconds and blue steel hands. Slim engine turned case, small slide in the engine turned middle to start and stop the independent seconds. Wound and set through the gold cuvette engraved with details of the movement.
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Diameter: 48 mm
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Signed: No name