DKW was a German two-stroke maker from Zschopau, started by Jorgen Rasmussen, and for a time the largest motorcycle maker in the world. Its RT 125 was copied by BSA, Harley-Davidson and several Japanese makers. After the war the firm moved to Ingolstadt and built the RT, the Hummel and the Hobby before it merged into Zweirad Union and later Hercules.
