MZ stands for Motorradwerk Zschopau, and it was located in the GDR (East Germany). These are great riding bikes. This one is a 250cc, air cooled, single cylinder two stroke. The ES model series was built between the years of 1956 to 1978. Only the “Trophy” variation had the Art Deco tank / headlight combination. It looks square from the front. It was nicknamed the “TV lamp” on account of the square headlight.