This is a beattie intenscreen for use in a Mamiya 645 Pro, Pro TL, or 645 super. It is NOT for use in the older Mamiya 645 cameras (eg, M645 1000s).
It has a diagonal split prism.
There is a wide but not deep scratch up the right side of the screen that I was unable to capture in the pictures.
If you have any questions, please do not hesitate to contact me.