French extremely rare and early skeletonized watch Circa 1775

Gold open faced repeating pocket watch by Mercier
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A French rare early skeletonized verge watch with striking train and repeating quarters, circa 1775. The watch features an 18 carat gold bicoloured case with a five part lateral hinge and glass on both sides. It has a rare, fully skeletonized movement, engraved and gilt, with polished steel parts. The bridge is signed Mercier Paris no. 2514, and the watch repeats hours and quarters a toc. The enamel dial is signed, shows Roman numerals for hours and Arabic numerals for minutes, and has its original hands.
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Diameter: 45 mm
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Weight: 76 g
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Signed: Mercier a Paris