Swiss 18 carat gold early crown winding pocket watch Circa 1850

Gold technically interesting cylinder watch 
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A technically interesting pocket watch with unusual crown winding made in Genève, Switzerland, for E. Cotte & Maupomé in Paris, France, circa 1850. The numbered open faced case of this watch, crafted from 18 carat gold, has an engine turned back with a vacant cartouche surrounded by engraved decoration. The white enamel dial has Roman hour numerals, outer minute divisions and gold hands. The movement has a cylinder escapement, eight rubies, and an early, patented version of crown winding and time setting.
The vendor’s box is signed.
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Diameter: 45 mm
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Weight: 71 g
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Signed: E. Cotte & Maupomé 137 Boulevard Sébastopol Paris
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The watch comes in the original presentation box.