Cartier. A fine and rare platinum openface keyless lever watch with two-tone silvered dial, 24 hour display and original box

Cartier. A fine and rare platinum openface keyless lever watch with two-tone silvered dial, 24 hour display and original box
Signed Cartier, Paris, case nos. 4909 and 4832, movement signed Cartier, Paris, circa 1920
With nickel-finished lever movement, 19 jewels, bimetallic compensation balance, the engine-turned two-tone silvered dial with black enamel Roman numerals, "Gothic" hands, inner ring calibrated for the Arabic 24 hour indication, in slim circular case with milled band and bow, the snap on back centred by an inlaid black enamel crown, case numbered, dial and movement signed
45 mm. diam.