In 1935, Universal launched the "Compax" chronograph family, the world's first chronograph wristwatch featuring minute and hour registers. Over the next 40 years, Universal successfully upgraded its chronograph manufacture and created a variety of versions with specialized complications in response to market demands (pilots, doctors, and engineers).

The intriguing Aero-Compax, with its four subdials, is one of Universal Genève's most distinctive models immediately appreciated by pilots, as well as the company's flagship timepiece. It includes an odd second time display at "12" in addition to the modest seconds, 30-minute, and 12-hour counters. In order to acquire a control time, this sub-dial allows the input time to be saved as a reference time. The hands may be adjusted with the left crown, but they do not move otherwise. This model features a high-gloss black dial with four black guilloche totalizers. Presented in excellent overall condition, the current 37mm size gives this timepiece a great vintage appearance and makes it a great addition into the collection of rare and historically important pilot watch collections.