see photo 18, looks to me that Ringo is holding a Nikkormat FTN. The chrome area near the shutter speed ring looks larger than I'd expect, though perhaps the lens itself (which I can't identify) had a chrome mount.
I think it just looks that way due it being brighter. Behind it is the aperture ring, which being dark, looks smaller.
Nice pictures of unguarded moments.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.