I refused to guess Nazzaro, because I thought it was a mistake from my side. From what I know, Nazzaro didn't exist after 1923, while Ceirano name resurfaced as a separate name (not SCAT) around 1925, so I decided they couldn't be present at the same exhibition. Anyway, no is no
![Smiley :)](https://www.autopuzzles.com/forum/Smileys/default/smiley.gif)
At least I was right guessing the fourth company was also from Turin
![Tongue :P](https://www.autopuzzles.com/forum/Smileys/default/tongue.gif)
P.S. I can see now that my mistake was related to Ceirano time frames.