3090. Universal Genève. A stainless steel manual wind triple calendar chronograph wristwatch with moon phase Universal Genève. Chronographe bracelet en acier avec triple calendrier et phases de lune mouvement mécanique Model: Tri-Compax Reference: 22541 Date: Circa 1945 Movement: 17-jewel Cal.287 manual wind, No.243890 Dial: Champagne, black Arabic numeral hour markers, black outer 1/5th second divisions and tachymetre scale, subsidiary dials at 3, 6 and 9 for seconds, 30 minute 12 hour recording, moon phase combined with date at 12, day and month apertures at 2 and 10, blued steel sword hands with luminous inserts, centre chronograph hand Case: Brushed and polished round, snap on back, crown flanked by twin chronograph buttons, quick set buttons to band at 8 and 10, No.1094415 Strap/Bracelet: Associated black leather Buckle/Clasp: Associated steel buckle Signed: Case, dial & movement Size: 35mm The Tri-Compax was Universals most complicated chronograph and was first introduced in 1944. The name derives from the combination of Triple calendar and compax for chronograph. The design of these watches was constantly evolving as Universal experimented with different configurations. In the 1960s Universal, keeping with the demands of the day, redesigned the Tri-Compax to appeal to a more casual and sports oriented market. The aesthetic of this model may be seen as a playful response to the Daytona and Speedmaster models of the same period.