The Gruen 833 watch movement is a hunter calibre mechanism that was produced in the period from 1891 to 1907. It features a bimetallic screw balance and a Breguet hairspring, providing accurate timekeeping. The movement incorporates a safety barrel to prevent overwinding and maintain longevity. It is designed for stem winding and setting, allowing easy and convenient time adjustment. Additionally, it includes a sub-second function to display seconds separately. The Gruen 833 movement is notable for being a pocket watch movement, manufactured in America during the stated time period.