English silver half quarter repeating duplex watch Circa 1790

Large half quarter repeating duplex pocket watch by Grant
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A large English half quarter repeating duplex by Grant, circa 1790. Full plate fire gilt movement with gilt dust cover pierced to reveal the diamond endstone and silver regulator disc, fusee and chain with worm and wheel barrel set up between the plates, pierced and engraved cock, diamond endstone in a blue steel setting, plain three arm steel balance, blue steel spiral hairspring, screwed in jewelling including the fusee arbour in a blue and polished steel setting. Duplex escapement, large brass escape wheel, and jewelled locking roller, pivots with endstones. Push pendant half quarter repeating on two polished steel gongs fitted in the band of the case. Fine white enamel dial with Roman numerals and attractive gold hands. Substantial purpose made plain silver open faced case with gold hinges and thumb pieces, London hallmark for 1906, maker’s mark F.T. in an oval, and London below.
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Diameter: 66 mm
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Signed: John Grant Fleet Street London
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The fine case was made by Frederick Thoms of Spencer Street, Clerkenwell who was usually used for chronometers and deck watches of the period.