Circular dial with Roman numerals, blue guilloché enamel, rose-cut diamonds, onyx plaque, silver and gold (French marks), circa 1920, mechanical movement, 7.3x7.3x1.2 cm, signed Cartier Paris, no. 539, red Cartier fitted case
Circular dial with Roman numerals, blue guilloché enamel, rose-cut diamonds, onyx plaque, silver and gold (French marks), circa 1920, mechanical movement, 7.3x7.3x1.2 cm, signed Cartier Paris, no. 539, red Cartier fitted case