Swiss 20k gold pair cased repeating verge Circa 1750-1760

Gold and enamel quarter repeater by Abraham Collomby & Co
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A Swiss 20 carat gold and enamel pair cased quarter repeating keywound verge watch, circa 1750-1760. Gilt finished engraved full plate jewelled verge movement, chain fusée, pierced and engraved balance cock, ruby set endstone, three armed balance, quarter repeating activated through the stem, repeating on a bell, dust cover. White enamel dial with Roman hours, gilt basket weave center zone, outer black Arabic five minute divisions and blued steel fleur-de-lys hands. Pierced and engraved inner case, pierced and engraved outer case stamped 20k, back cover with guilloché blue enamel background, red and white enamel lilies with gilt folliage, blue guilloché enamel bezel, red and white enamel lilies with gilt folliage, diamond set opening. Movement and dust cover signed, movement numbered, inner case back stamped GLD, outer case stamped 20k.
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Diameter: 48.5 mm
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Signed: Abraham Collomby & Co