Kundo was a German clock manufacturer that launched in 1918 as a partnership between established clock makers Johann Obergfell and George Kieninger. It only took a few years for them to release the clock that would become a brand staple - the anniversary clock.
Anniversary clocks - or 400-day clocks, as they're also called - are a specific type of mechanical clock which uses a torsion pendulum to keep time. Instead of moving back and forth, the pendulum moves clockwise and counter-clockwise. Despite being manufactured between the 1920s and 1960s, Kundo's anniversary clocks have a design that feels like it'd be right at home in Galileo's astronomy tower.
By the 1950s, Kundo had started making electronic clocks, but they haven't held up with the same collector interest that their classic anniversary clocks have.