Cartier. A rare and unusual platinum and onyx square openface keyless lever dress watch with two-tone silvered dial

Cartier. A rare and unusual platinum and onyx square openface keyless lever dress watch with two-tone silvered dial
Signed Cartier, case nos. 15'316 and 13'035, movement signed European Watch and Clock Co., Inc., manufactured in 1925
With nickel-finished lever movement, 19 jewels, bimetallic compensation balance, the engine-turned silvered dial with Roman numerals on blank inner chapter ring, outer ring for the baton minute divisions, unusually shaped blued steel hands, in square onyx case with platinum bezel secured by four screws, platinum pendant and bow, case numbered, dial signed, movement signed E.W.C.
44 mm. wide