French cylinder fob watch with matching chatelaine Circa 1860

Gold, enamel, jasper and pearl-set fob watch
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A fine and rare French, 18K gold and polychrome enamel, jasper, and pearl-set fob watch with matching chatelaine, circa 1860. Accompanied by the original fitted leather box. Retailed by Fontana Frères, Palais Royal, Galerie de Valois 22-23-24, Paris. Made for a Duchess “C.N.” The case with a coin-edge band, back a single piece of brown jasper with an applied gold ducal crown. Hinged gold cuvette.
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Chatelaine: the top designed as a shield from a single piece of brown jasper mounted in yellow gold with applied enamel coat of arms, flanked by two lions rampant and surmounted by a gold, enamel, and pearl-set ducal crown, gold spoon, three gold chains; one for the watch, one for a matching seal, and another for a matching key. White enamel dial, radial Roman numerals, outer minute divisions. Gold Breguet hands. A frosted gilt movement, bar calibre, ten jewels, cylinder escapement, three-arm gilt balance with balance spring. Signed on the cuvette, retailer inside the box, the box marked on the outside with the ducal crown and the Duchess’ initials.
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Diameter: 28 mm
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Length chatelaine: 140 mm
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Signed: Ducal Coronet Lassalle & Cie  Paris