The General 90 is a mechanical watch movement that was produced from 1937 to 1970, with over 3.5 million units manufactured during this period. It had various chronograph mechanisms, and some series were assembled using interchangeable parts from different calibers, including the Landeron 58 which featured a larger pillar plate. The General 90 is a manual-wind chronograph movement with a 60-second sub-dial and cam switching. It also includes additional functions such as a tag pusher at 10:30 o'clock, a date hand operated by a pusher at 4:30 o'clock, and a month indicator operated by a pusher at 1:30 o'clock.