ENAMEL, ONYX AND DIAMOND LAPEL WATCH, CIRCA 1925, Cartier, Paris

Of Art Deco style, fitted with an oval case housing a white dial applied with Roman numeral markers and blue steel hands, bordered by a decorative black enamel bezel, the obverse set with an onyx plaque centring on a line of French-cut diamonds, framed by millegrain-set circular-cut diamonds, supported by a black cord embellished by rose-cut diamonds, to the door-knocker-shaped surmount, mounted in platinum and 18 karat yellow gold, mechanical movement, signed Cartier to the dial, numbered CG22859, French assay marks.