1940s Universal "AERO-COMPAX" Stainless Steel 36mm Waterproof Chrono Black Dial

1940s Universal "AERO-COMPAX"? ss 36mm water proof chronograph with a very rare black dial. It is a special chronograph with a memento dial, an in-dial for storing the time, and the memento dial at 12 o'clock is operated by a special crown at 9 o'clock. The unparalleled four-eyed dial design shows the originality that only Universal, a manufacturer of many chronograph movements, can offer, and the rare black dial that retains its beautiful luster is a gem of great taste. This is a rare example of a screw back water resistant watch that is dust proof, a rarity among the many variations of Aerocompax.