A RARE ART DECO ROCK CRYSTAL, DIAMOND AND MULTI-GEM 'MYSTERY' CLOCK, CARTIER

A RARE ART DECO ROCK CRYSTAL, DIAMOND AND MULTI-GEM 'MYSTERY' CLOCK, CARTIER
Octagonal rock crystal dial, blue, black and white enamel, onyx, rose-cut diamonds, circular cabochon turquoise, 18k gold (French mark), mechanical movement, key is deficient, circa 1925, 3 3/8 x 5 3/8 x 1 5/8 ins., signed Cartier, no. 559, black base shows signs of possible repair or replacement, red Cartier case