Sirius Glass
Subscriber
The C220 probably didn't get its name from the film format - it replaced the C22, it was mostly contemporary with the C330 (which replaced the C33), and both the C220 and C330 could use 220 film.
The C22 couldn't use 220. Apparently there were some late 220 modified versions of the C33 made.
I agree. It went from C2 and C3 to C22 and C33 and then C220 and C330. I believe that they all took 120 and 220 film with and adjustment made with the film pressure plate.