Swiss quarter repeating watch decorated with tortoiseshell Circa 1790

Silver and tortoiseshell quarter repeating pocket watch
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A rare silver Swiss quarter repeating pocket watch with an under-painted tortoiseshell case, circa 1790. Full plate gilt verge movement, pierced and engraved cock with polished steel coqueret, silver regulation disc with copper indicator.
Two silver cases: outer case decorated with tortoiseshell, inner case with plain back and ribbed band, with bell.
White enamel dial with Arabic numerals and gold hands. Verge movement, repeating the hours and quarters. Dial and movement plate signed G. Achard & Fils a Genève.
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Diameter: 59 mm
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Weight: 146 g
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Signed: G. Achard & Fils a Genève
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George Achard & Fils, Genève circa 1780.
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The case is damaged at the back.
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Reference 013500