Swiss gold enamel lady’s keyless pendant watch Circa 1900

Gold lady’s watch retailed by T. Martin & Co. London
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A fine and elegant 18 carat gold, enamel and rose-cut diamond-set, lady’s keyless pendant watch with detachable gold, pearl and diamond-set Art Nouveau brooch fitting. Made in Switzerland and retailed by T. Martin & Co., 151, Regent Street, London  Circa 1900.
Four-body, bassine and foliate engraved case with decorated back with translucent royal blue enamel over radial engine-turning, central gold fleur-de-lys set with rose-cut diamonds, chain suspension and the interior of the back with engraved inscription.
White enamel dial with Arabic numerals, gold paillon dot minute divisions, subsidiary seconds and gilt Louis XV hands.
Matte gilt movement with 17 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring and an index regulator.
Dial and cuvette signed by the retailer.
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Diameter: 29.5 mm
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Signed: T. Martin & Co.