Swiss 18k gold, enamel keywind lady’s pendant watch Circa 1850

Gold cylinder with the portrait of a young lady
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A fine Swiss, 18k gold and enamel keywind lady’s pendant watch, circa 1850. A solid, hinged case back with black enamel and foliate outer to central framed black & white scene of a young girl, coin-edge band, hinged gold cuvette. White enamel dial with Roman numerals, outer minute and Arabic five-minute divisions. Blued steel Breguet hands. Gilt bar movement, seven jewels, cylinder escapement, plain three-arm balance, blued steel flat balance spring, index regulator. Cuvette signed, case numbered.
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Diameter: 32 mm
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Signed: No Name
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The case is slightly scratched and the movement is oxidized.