I've a news..!!
I found our man in Todo Modo
(1976) where he plays Franco Lombo
According to many books (DCI, Grazzini's Cinema '76, etc..) Franco Lombo
is played by MARIO BARTOLI
, who appears also in the credits.
I'm pretty sure 'Mario Bartoli' should be an AKA for 'Mario Bartolomei' (..or vice versa):Mario Bartol
According to IMDB 'Mario Bartoli' is credited also for:
-Maestro di violino (1976)
-Amore mio spogliati... che poi ti spiego! (1975)
-I 2 deputati (1968)
..and we already know he really appears in I 2 deputati