Work on the construction of the first chassis has been completed 28 February 1948 year, and four months later (exactly 19 June) the first Star-20 car was ready. Soon, three more prototypes were made and four cars were road tested at the qualifying rally along the route of 3212 km. The faults were removed on an ongoing basis and the rally confirmed the correctness of the design assumptions. The fuel consumption of the first Star-20 cars was 39,7 dm3 / 100 km. The first five cars were presented in Warsaw during the party's merger congress. Recalls Wiesław Staniszewski - an employee of Zakłady Starachowickie from 1947 year:
“There were just five of us working on the launch of production for the Star car 20. I remember, that the frames were supplied by Huta Stalowa Wola, driver's cabins Huta Ludwików, the engine, on the other hand, came from the Ursus Experimental Plant. In December, my car was running. On December 13, we launched the next four. Then we found out, that we will go to the convention in Warsaw. When we left this larger village, which was then Starachowice, to the capital - there was a holiday at the plant. The gate was decorated, we were said goodbye very solemnly. When we got to the square in front of the Warsaw University of Technology, the delegates began to look at the cars- many did not believe, that they are really Polish. The plate with the factory mark and the inscription Fabryka Samochodowych in Starachowice was made by hand from bronze sheet, so was considered, that only this tablet is really Polish. To convince the doubters… we decided, that he will go from Starachowice to Warsaw for the May holiday next year 30 Star cars 20. And that's how it happened."
Day 15 of December 1948 year can be considered the birth of the Polish post-war automotive industry. The first five Polish trucks, placed in front of the building of the Warsaw University of Technology, symbolized the revival of the domestic automotive industry, and people from Starachowice were especially proud of the fact, that it was their city and them that played a pioneering role in this important one, historical fact.
Other institutions were established, working for the automotive industry: w 1946 year - Central Technical Office of the Automotive Industry, conducted by MSc. Zdzisław Rytel and then (from 1947 year) by mgr inż. Zygmunt Okołów, in years 1946-1947 The Automotive Institute was established at the Warsaw University of Technology - an advisory and consultative body under the leadership of prof. Kazimierz Studziński and prof. Adam Minzheimer. W 1950 CBK year no 5 merged with the Automotive Institute, creating the Automotive Industry Design Office.