English 18k gold and enamel verge pocket watch Circa 1790

Gold lever with a fancy gold chain and lapis key
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A very fine and rare English, 18K gold and enamel pocket watch with a fancy gold chain and lapis key, circa 1790. Hinged and sprung bezel decorated with translucent royal blue and white champlevé enamel repeated triangular pattern, pendant and bow decorated to match, the backset with a translucent royal blue enamel panel over engine-turning, outer border to match the bezel. White enamel dial with Arabic numerals, outer minute divisions. Gold arrow hands. A matte gilt, full plate movement, cylindrical pillars, fusee with chain, verge escapement, three-arm steel balance, flat balance spring, single footed balance cock finely pierced and engraved with foliage, silver regulation dial. Movement signed.
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Diameter: 53 mm
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Signed: Dane  London
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The case is slightly scratched, and the dial has some restored soft enamel.
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The rich colour and depth of the blue enamel panel on this watch are extremely beautiful.