C. Three-body, solid, polished, bidirectional rotating bezel to operate the slide-rule, screwed-down case back and crown, case back embossed with the Continental Gt car, lapidated lugs, sapphire crystal. D. Black with applied yellow gold indexes and luminous square dots, subsidiary dials for the seconds, the 12-hour and 30-minute registers, outer silver revolving slide-rule graduations, aperture for the day and date. Luminous gold baton hands. M. Cal. 13B, rhodium-plated, 25 jewels, straight-line lever escapement, monometallic balance, shock absorber, selfcompensating flat balance spring, micrometer regulator, hack mechanism. Dial, case and movement signed. Diam. 45 mm. Thickness 16 mm.