3 decal variants:
1. Tatra T-134.5, OK-TAF, Masarykova letecká liga, Olomouc-Holice, květen 1938
2. Tatra T-134.9, OK-TAK, 104. kurýrní letka, říjen 1938
3. Bücker 131, D-EDYD, W. Nr. 4002, Kopřivnice, duben 1939
The first flight of the prototype Bü 131 (D-3150) was made on 27 May 1934 with Joachim von Köppen as the pilot. The aircraft was powered by a Hirth HM 60 R inline four-cylinder engine with a power of 59 kW. Series production of the Bü 131 A version was started in 1934, with the Deutscher Luftsportverband as the main customer. In 1936, the Bü 131 B series was launched, which differed by the built-in 77 kW Hirth HM 504 A-2 engine.