Bosch is an electronic and engineering company. It was founded by Robert Bosch in Stuttgart Germany in 1896. Among other things Bosch was an early pioneer in the magneto for gasoline engines. Bosch magnetos were installed on a number of mopeds over many years. There are many small variations in Bosch moped magnetos, for example 80mm diameter and 90mm diameter, and clockwise and anti-clockwise rotation. Many are quite similar and will interchange between brands.