On the web I've found the car always described as a Colli 1100 from 1951...
Are you sure about your source?
I'm not 100% sure of the date myself, no. It, or a similar car, appears on different sites with 4 different years, so it may be that different versions were made in different years. As far as the name goes, I think that was just the event that the puzzle car took part in and was not part of the name - but it's at the early end of the date range!
I'll lock it for you to look into and see if you can give me the range of dates this car suits and perhaps which one this is definitively, as they all seem to have different windscreens and wheels!
Locked for your reply.