Swiss gold pair cased half-quarter repeating pocket watch Circa 1780

Gold, enamel and diamond-set watch
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A fine and rare Swiss, half-quarter repeating, pair cased, varicoloured gold and rose-cut diamond-set pocket watch with a painted on enamel portrait of a young lady, circa 1780. Outer: A Louis XVI case, bezel engraved with a guilloche pattern and set with rose-cut diamonds, the backset with an oval painted on enamel portrait of a lady in a green translucent and white and gold enamel border, rose-cut diamond-set frame with ribbon cresting, chased varicoloured gold laurel border.
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Inner: The band is pierced and engraved with foliage and a mask. Gilt dust cover. White enamel dial with radial Roman numerals, outer minute track and large Arabic five-minute numerals. Rose-cut diamond-set hands. A gilt brass movement, full plate with fusee and chain, verge escapement, three-arm brass balance with flat balance spring, balance cock with single foot, silver regulation dial. Dial, dust cap and movement signed.
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Diameter: 43 mm
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Signed: Pierre Reguillon  Genève
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Missing pearl(s)/stone(s).
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Pierre Reguillon was a master horologist 1780, known for making repeating watches with gold, enamel and jewels.