Pye Mk4 Television Camera

This Pye Mk4 is awaiting restoration. On the plate it is marked as a Mk3 serial number 400! I suspect this is a plate from the previous generation of cameras and that this camera is a factory prototype. Other, later, pictures of the camera in use show a few differences.
At the rear is the periscope viewfinder hood, the rubber facemask is missing.

It is reported that the design work for the Mk4 cameras started in 1957.