French two coloured gold and enamel repeating pocket watch Circa 1780

Gold and enamel open faced verge by Mr. La Roche
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A French, elegant and very fine à deux couleurs gold enamel quarter repeating verge pocket watch, circa 1780.
The case is 18-carat gold with polychrome enamelled back side, an oval cartouche, an engine turned and translucent cobalt blue frame; a two colour gold case band with tendrilled engraving, and rear bell. The dial is enamel with radial Roman hours, outer Arabic five-minute divisions and gold hands. And the movement is a full plate movement, keywind, gilt, with chain/fusee, two hammers, solid movement pillars, three-arm brass balance and a pierced balance bridge.
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Diameter: 40 mm
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Weight: 58 g
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Signed: Mr. La Roche à Paris