French rose gold, pearl set verge with display back Circa 1790

Unusual open faced verge watch with glazed display back by Gregson
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A fine and unusual French 18 carat rose gold and pearl set open faced verge watch with glazed display back, circa 1790. Gilt finished slim verge movement, finely engraved and pierced balance cock, chain fusée.
White enamel dial with Roman numerals and gilt serpentine hands. Case with pearl set bezel and rim, applied chased and engraved scroll decorated floral initials to the glazed crystal back. Dial and movement signed.
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Diameter: 47 mm
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Signed: Gregson à Paris