Lot 140. An Art Deco rock crystal, enamel, onyx and diamond Demi-Mystery clock, by Boucheron, circa 1921. Estimate £25,000 - £45,000. Courtesy Bonham's. 

The faceted rock crystal case framed by a gold and black enamel surround, with rose-cut diamond Roman numerals, the central dial decorated with gold and black enamel forming a rosette with rose-cut diamond geometric style hands and black and gold enamel bezel, on rock crystal supports and a vase-shaped plinth further applied with black and gold enamel, onyx base, case unsigned, numbered 2978629, French assay marks, movement signed Longines, 13cm x 12cm x 6.7cm, fitted Boucheron case..

Provenance: Property from a European Private Collection.

Bonham's. London Jewels, December 4, 2019 2:00 PM GMT