Gold Swiss enamel heart form keyless pocket watch Circa 1900

A yellow gold enamel heart form keyless pendant watch
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A yellow gold Swiss enamel heart form keyless pendant watch, circa 1900, gilt jewelled movement with cylinder escapement, plain three-arm balance.
White enamel dial, Roman numerals.
Heart-shaped case with geometric blue and red enamel decoration. The reverse is centred by an enamel portrait of a lady in period costume, with blue and red enamel decorated pendant and bow.