Cartier. A fine and rare platinum openface keyless lever jump hour dress watch

Cartier. A fine and rare platinum openface keyless lever jump hour dress watch
Signed Cartier, case nos. 6798 and 9737, movement signed Cartier Paris, manufactured in 1916
With nickel-finished lever movement, 18 jewels, bimetallic compensation balance, the engine-turned sunburst decorated silvered dial with an aperture for the jumping Arabic hours, outer five minute divisions with central blued steel hand, in plain circular case with snap on back, case numbered, dial and movement signed
45 mm. diam.