Swiss gold verge ring watch with exposed balance Circa 1820

Gold, enamel, pearl and diamond set keywound ring watch
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A fine and rare Swiss gold, enamel, pearl and diamond set keywound verge ring watch with exposed balance, circa 1820. Verge movement, chain fusée. White enamel time display with Breguet numerals, smaller dial above for seconds, the face centred by an aperture revealing the balance with diamond set ends, all on translucent blue enamel over engine turned ground, opaque white enamel highlights to the gold foliate decoration, pearl set bezel, the elongated octagonal case affixed to the ring shank.
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Length: 31.5 mm
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Ring size: 6½
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Signed: No name