I have the impression the Rollei company was created to make twin lens reflex cameras using 120 roll film.
The familiar Rollei though clumsy by modern standards fitted in the palm of the hand -
But Kimber is holding a heavy awkward looking press/professional plate camera. Could it be some form of (or equivalent to) the American made R B Graflex (single lens reflex) camera made by Kodak?
I cannot imagine Kimber carrying round such a large and awkward camera containing only one photographic plate. I think the picture was posed with Kimber smiling self consciously holding a camera which Bill Brunell has thrust into his hands. Brunell seems to have had a gift for taking unconvincing stilted pictures of people looking awkward. Even so, Brunell's photographs are always interesting.
A disadvantage with early TLR's is that the image projected on the viewing screen is reversed making it nigh on impossible to snap anything appreciably moving.
The composite below shows these are completely different cameras.
So far as I know, all these twin lens reflex cameras have a reversed image. To follow fast action the Rollei is prefocused and the viewfinder is set up as a 'sports viewfinder' allowing the photographer to look directly at the subject making it easy to follow movement.
If it is a Rollieflex it’s probably the Original, not the Standard as the Original had a circular knob to wind the film on which looks like it might be present in the camera Kimber is holding. See the first camera pictured by Sam above. .
Kimber's camera looks twice the size of my Rolleiflex. My current guess is that Kimber was holding a British made single lens reflex Ensign camera - or something very similar - much larger than a Rollei and not a roll film camera.
Look at the hand size below relative to the Rolleis and compare them to Kimber's and the camera he is seen holding.