Kodak used their own film formats, 620 spools can be used to re spool 120 film.
Others can be used with 35mm laid inside the appropriate papers.
The basic shutter has a sliding bar which adjust theaperture on this model.
As the smaller 127 this has a catch on the base to lock/seperate the body so that film can be loaded.
Kodak Brownie Cresta 3
Using the same body as the II this is, once again, a 120 film camera.
In all respects it's the same as the II, but with a new 'modern' top in grey plastic.