Rolex 6263 - 18k gold case, black dial.
Three-body, solid, polished and brushed, screwed-down case back, buttons and crown, tachometer graduation on the gold bezel to 200 units per hour. D. Bicolor champagne and black with applied yellow gold faceted baton indexes and luminous dots, outer 1/5th seconds divisions, subsidiary dials for the seconds, 12-hour and 30-minute registers. Luminous yellow gold baton hands. M. Cal. 727, rhodium-plated, 17 jewels, straight-line lever escapement, monometallic balance adjusted to 3 positions, shock absorber, selfcompensating free-sprung Breguet balance spring, Microstella regulating screws.