Technically interesting Swiss gold lever watch Circa 1880

Gold  lever with rare crown winding
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A technically interesting Swiss 18 carat gold open faced lever pocket watch with rare crown winding in the manner of Courvoisier and fine enamel en grisaille painting, circa 1880. Glazed, early lever movement, in the manner of Courvoisier, Patent No. 1114 of 1873. Very fine enamel dial with Roman hours and outer minute divisions, showing the four seasons with angels, subsidiary seconds, rose gold hands. Case with a monogram over engine turned on the back.
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Diameter: 51.5 mm
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Weight: 91 g
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Signed: No name
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The patent movement of Courvoisier was also used for pocket watches of Patek, Philippe.
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A grisaille (en grisaille), or grey painting, is a painting in which one does not apply natural colours but restricts oneself to depicting things in all possible shades of the same colour, usually grey or brown.