The 1923 P1 team for the Italian Grand Prix; Antonio Aascari, Ugo Sivocci &  Giuseppe Campari.  
   
 
year of production 1923
no. made 3
engine 4 in-line
  1.990 cc
  95 hp
max speed 180 km/h
Gran Premio Romeo 1923 (P1)

The P1 never started in a race. Driver Ugi Sivocci crashed and died in the training for the 1923 Italian G.P. This was the end of the P1 and of Merosi. In 1924 one of the cars was equipped with a Roots-compressor and became the P1 Compressore 1924.

Merosi's successor Jano worked on the successful P2.