French verge pendant watch with chatelaine key and seal Circa 1790

Gold enamel pearl and diamond-set pendant watch
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A very fine French, 18 Carat gold and enamel, pearl and rose-cut diamond-set pendant watch with matching chatelaine, key and seal, circa 1790. Accompanied by the original gold tooled leather fitted box. The back is decorated with translucent royal blue enamel over engine-turning with the applied diamond-set words Gage D’Amitié, split pearl-set bezels. Chatelaine: single crest form panel decorated en suite with the applied diamond-set words Pensez a moi, three matching chains; for the watch, seal and key.
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White enamel dial, upright Arabic numerals, outer minute divisions with fifteen-minute Arabic numerals, winding aperture at 2 o’clock. Gold tapered serpentine hands. A frosted gilt full plate movement with cylindrical pillars, fusee and chain, verge escapement, brass balance with flat balance spring, continental type cock, silver regulator dial. Dial and movement signed.
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Diameter: 47 mm
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Length chatelaine: 200 mm
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Signed: Guex  Paris