Cartier: A rare 1920's platinum Curvex Tonneau wristwatch, the matt silvered dial with Arabic numerals and blued steel moon hands, the platinum back with integral dust ring secured by four screws to the band, numbered 121346 27656 .5285., the polished bar movement with bimetallic balance jewelled to the centre with eighteen jewels and eight adjustments, signed European Clock & Watch Co. Inc., with black leather strap and gold deployant clasp