Enversteel "Tri-Compax" Universal, Genève, "Tri-Compax". Made circa 1960. Fine, astronomic, “Enversteel”, gentleman's wristwatch with square button chronograph, registers, tachometer, triple date, moon phases and a stainless steel Universal buckle. Three-body, polished and brushed, inclined bezel, curved lugs. Brushed silver with luminous dot indexes, outer minutes and fifths of a second track concentric blue tachometer scale, subsidiary dials for the seconds, the 12-hour and 30-minute registers, graduation for the date around the moon phase aperture, apertures for the days of the week and the month. Luminous "lozenge" hands. Cal. 481, frosted gilt, 17 jewels, straightline lever escapement, monometallic balance, self-compensating Breguet balance spring, index regulator. Dial, case and movement signed. Diam. 36 mm. Thickness 13 mm.