Swiss decorative triple-cased verge pocket watch Circa 1770

Gold and enamel verge in triple cases
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A Swiss decorative 18K gold and enamel triple-cased verge pocket watch, circa 1770.
Gilt transport case with glazed back, large lateral hinge, gold and enamel outer case, the back with a polychrome enamel miniature portrait of a young lady framed by a translucent green border, the band engraved and partly enamelled, paste-set bezel, large lateral hinge, plain gold inner case. White enamel dial with radial Roman hours, Arabic minutes and Louis XV hands. Fire gilt full plate movement, applied decorations, key-winding, chain/fusee, baluster-shaped pillars, three-arm brass balance and engraved pierced balance cock with shellwork, signed.
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Diameter: 51 mm
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Weight: 106 g
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Signed: Les Fr. Esquivillon & DeChoudens
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Les Frères Esquivillon & DeChoudens, Geneva watchmakers. Jacques Dechoudens (1728-1801) and brothers Joseph (1714-1798), Jean-François (1733-1813) and Gédéon-François Esquivillon (1717-1799) founded a workshop which produced high-quality verge pocket watches.