French varicoloured gold quarter repeating pocket watch Circa 1765

Gold and paste-set pocket watch
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A fine French Louis XV varicoloured 18K gold and paste-set quarter repeating pocket watch, circa 1765. The back is decorated with an applied varicoloured gold monogram within a paste-set border, the outer border with varicoloured urns on pedestals and a dog and flower basket, border and bezel chased and decorated with a lozenge and wheatear pattern, the bezel also set with pastes. White enamel dial, radial Roman numerals, outer minute track with five-minute Arabic numerals, winding aperture at 2 o’clock and elaborate paste-set hands. A frosted gilt full-plate movement with cylindrical pillars, fusee and chain, verge escapement with micrometric potence adjustment, brass balance with flat balance spring, continental cock, repeating on a bell in the back of the case activated by depressing the pendant, à tact option via a pin protruding from the bezel at 8 o’clock. Movement signed. 
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Diameter: 42 mm
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Signed: Dutertre  Paris
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Jean-Baptiste (II) Dutertre (1715-1772) Came from a well-established family of watchmakers. His father, Jean-Baptiste, was one of the first to experiment with double pendulum clocks. Jean-Baptiste (II) became a master in 1735 and took over his father’s workshop on Quai des Orfèvres. In 1742 presented to the Académie Royale des Sciences an interesting clock and equation watch. He had a nephew (1743 about 1778) of the same name who was also a watchmaker.