UNIVERSAL GENÈVE AÉRO-COMPAX, STEEL Universal Genève "Aéro-Compax", movement No. 210817, case No. 1005153, Ref. 22538. Made in the 1950?s. Fine and rare, stainless steel wristwatch with round button chronograph, registers, tachometer and two crowns.

C. Three-body, polished and brushed, curved lugs, winding crown at 9 for adjusting the memento dial, snap on case back, sapphire crystal. D. Silver with applied luminous dots, outer minutes/seconds divisions with every fi ve Arabic markers, subsidiary dials for the seconds, the 12-hour and 30-minute registers and the memento in 12 hours, outer tachometer scale. Luminous steel "lozenge" hands. M. Cal. 287, rhodium plated, straight line lever escapement, monometallic balance, self-compensating Breguet balance spring, index regulator. Dial, case and movement signed. Diam. 37 mm. Thickness 12.5 mm.