5 obtiskových variant:
1. Bü-133B, YR-PAX, Alex Papana, Romania aerobat ace, Cleveland Air races 1937
2. Bü-133B, D-EAKE, Walo Hörnig, 1936
3. Bü-133A, Legion Condor, Spain 1938
4. Bü-133A, Luise Hoffman, Rangsdorf 1935, Walo Hörnig, Laussane 1935
5. CASA 1131L, Spain 1940
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.