English silver and ray skin pair cased coach clock Circa 1760

Coach clock with repeater and alarm
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An English silver pair cased quarter repeating coach clock with alarm and double wheel duplex escapement according to Dutertre, circa 1760. Unusual double wheel duplex escapement according to Dutertre, here with 11 teeth and a pair of vertically stacked, star shaped steel wheels, full plate movement, two barrels for striking and alarm train, three hammers, three armed brass balance.  Silver champlevé dial with central engraved turnable alarm disc. Silver inner case embellished with Baroque foliage scrolls, rear bell, silver outer case coated with ray skin and decorated with ornamental studs and sound holes.
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Diameter: 107 mm
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Weight: 1150 g
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Signed: Cabrier London
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Charles Cabrier II
Charles Cabrier, a French watchmaker who emigrated to England after the revocation of the Edict of Nantes, and his son, Charles Cabrier II, were both reputed makers. Cabrier himself began his apprenticeship in 1719, was a member of the Clockmakers‘ Company from 1726 on and a master from 1757 until 1772. Until 1759 he had a workshop in 79 Broad Street, near Finsbury Circus, he then moved to Pig Street, which does not exist anymore, near Threadneedle Street. The watch we have here may have been a joint effort by Charles Cabrier II and his son. Baillie mentions Charles Cabrier II as a “famous maker”, Britten calls him a “celebrated maker”. 
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Jean Baptiste Dutertre (1684-1734)
Jean Baptiste Dutertre was born on November 6, 1684 in Rennes. His father was the clockmaker François Dutertre. He went to Paris around 1701 and apprenticed with Jean-Baptiste Le Noir. Dutertre worked in the Rue Harlay near the Quai des Orfèvres from 1712 on and soon gained a reputation as an excellent maker. Together with Pierre Le Roy, Dutertre refined the duplex escapement. He also invented the Dutertre escapement for pendulum clocks, a recoil escapement used for double pendulum clocks. Jean Baptiste Dutertre died on July 22, 1734 in Paris at the age of 49.