Minerva 13.20

The 13.20 is a manual-winding monopusher chronograph manufactured by Minerva since 1908. It measures 12¾ lignes in diameter, features 17 jewels, and employs a column-wheel control mechanism with a Breguet balance spring. One of the first wristwatch chronographs, it remained in production through the 1960s and was remanufactured until 2000; after 1940, the movement was also offered in double-pusher configurations.