Three-body, polished and brushed, inclined bezel with 5 screws, concave lugs, transparent case back with 8 screws, screweddown octagonal winding-crown, sapphire crystals. D. Black with applied luminous steel baton indexes, subsidiary dials for the seconds, 12-hour and 30-minute registers, the days of the month, of the week, the months and the leap year, outer 1/5th seconds and minute division, outermost tachometer scale, aperture for the moon phases. Luminous steel baton hands. M. Cal. E 288, rhodium-plated, fausses cotes and oeil de perdrix decoration, 27 jewels, straight line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring. Dial, case and movement signed. Diam. 44.5 mm. Thickness. 14.5 mm.