I need some help from you guys! I think
that I maybe found this man in "25° giro", a fotoromanzo-a-puntate that was published in the magazine Sogno during 1968. Unfortunately, I only have Part 10, which is only 4 pages so there aren't really any good photos of him. But I do think it looks like him. Take a look at these scans and see what you think:
What do you think? Is he our man? If he is then we know his name because he was credited and his name is Manlio Dalla Pria:
According to the IMDb, Manlio Dalla Pria is credited in the film Le inibizioni del dottor Gaudenzi, vedovo, col complesso della buonanima
(1971), and is a production secretary in some other films...