5 decal variants:
1. Bü-133C, AX-IH, JG/54, Luftwaffe, 1942
2. Bü-133C, SP-BDG, airfield Mokotóv, Poland, 1938
3. Bü-133A, YR-PUF, Adaptarea, Bucharest, 1940
4. Bü-133C, Stab. IV/LLG 1, Kragujevac, Luftwaffe, 1941
5. Bü-133C, "Black 6" of 1./JG 107, Luftwaffe, 1943
First flown in 1935 (by Luise Hoffmann, the first female works pilot in Germany), it was slightly smaller than the Bü 131. The prototype, D-EVEO, was powered by a 140 hp (104 kW) Hirth HM506 inverted, air-cooled inline-6 engine. The aircraft showed "astonishing agility" at its first public appearance, the 1936 International Aerobatic Championship at Rangsdorf, but the Bü 133A garnered no orders; only two Bü 133Bs, with 160 hp (119 kW) version of that same Hirth HM506 inline-6 engine, were built. The main production type was the 160 hp (119 kW) Siemens-Bramo Sh 14A radial powered Bü 133C, which had a distinctive cowling and a 13 cm (5.1 in)-shorter fuselage, and the same fine aerobatic performance as the Bü 133A.