C. Three-body, polished, screwed-down case back with embossed logo and engraved temperature conversion scale from Celsius to Fahrenheit, bidirectional revolving reeded and graduated steel bezel, lapidated lugs, sapphire crystal. D. Bicolor black and silver with luminous Arabic numerals, guilloche subsidiary dials for the seconds, the 12-hour and 30-minute registers, outer 1/5th seconds scale, tachometer and telemeter graduation and slide-rule. Luminous steel baton hands. M. Cal. 7750, 17 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, micrometer regulator. Dial, case and movement signed. Diam. 41 mm. Thickness 13 mm.

Ref Variations: L13019, B13019, A13019, B13019,