Cartier, a diamond wristwatch, mid 20th century composite, the narrow rectangular dial applied with

Cartier, a diamond wristwatch, mid 20th century composite, the narrow rectangular dial applied with white enamel, with black enamel Roman numeral indicators and blue steel hands, to a later bracelet set with circular-cut and marquise-shaped diamonds, bracelet length 15.8cm, case width 0.8cm, manual winding movement, dial signed Cartier London, case back numbered V6429, bracelet stamped Pt950, clasp tongue stamped OR, maker's mark for Gübelin