sentences:  Beginning in 1933 there was also a 6C version with an Alfa factory body, built in Portello.In the early 1920s Vittorio Jano received a commission to create a lightweight, high performance vehicle to replace the Giuseppe Merosi designed RL and RM models.The car was introduced in April 1925 at the Salone dell' Automobile di Milano as the 6C 1500.