Swiss verge with matching repoussé chatelaine Circa 1780

Gold pair-cased verge pocket watch by Colin
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A Swiss, remarkable pair-cased verge pocket watch with date indicator and matching repoussé chatelaine, circa 1780.
Two cases: outer case brass gilt, covered with tortoiseshell, à goutte; inner case gold, the back lid with an opaque polychrome enamelled medallion depicting a blooming rose-twig, and with a florally engraved bezel. Corresponding chatelaine with repoussé decoration, length: 140 mm. Enamel dial with radial Roman hours, inner subsidiary chapter ring with Arabic numerals for the date, and Fleur-de-Lys hands. Full plate movement, keywind, finely florally hand-engraved, signed, chain/fusee, three-arm brass balance, and pierced balance bridge.
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Diameter: 53 mm
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Weight: 105 g.
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Signed: Colin à Genève
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Louis Colin, French-Swiss watch case manufacturer and watch dealer
Louis Colin was born in Paris, France and was a citizen of Geneva on November 24, 1753.
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Repoussé 
A pattern in relief made by hammering or pressing metal from the reverse side.
Gold, silver and copper all lend themselves well to this technique.