French 18k gold, agate quarter repeating à toc pocket watch Circa 1780

Gold open faced cylinder pocket watch
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A fine and rare French, quarter repeating à toc, gold and agate pocket watch with original cylinder escapement, circa 1780. A Louis XVI case, polished bezel and band, the back carved from a single piece of striated mauve agate, paste-set thumb-piece. White enamel dial with Arabic numerals, outer dot minute divisions and Arabic 15-minute numerals. Gold Louis hands. A gilt full-plate movement, cylindrical pillars, fuse and chain, early-type cylinder escapement with 12 teeth, three-arm brass balance, flat balance spring, balance bridge with steel endplate, rack and pinion regulator, repeating on blocks inside the case band activated by depressing the pendant.
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Diameter: 36 mm
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Signed: No Name