I got at the fleamarket a (Polaroid-made?) camera-body with fixed packfilm back similar to the type 405 cassette.
It has a flipping accessory shutter, several tripod threads and a standard flashlight/accessory shoe.
The front has a coupling, seemingly for a lens/shutter assembly.
As I realized that the packfilm back was just screwd onto the body I bought it just to have that back to custom build some instant camera.
Seeing that accessory shutter I also considered as alternative use to keep it as it is and just install a pinhole.
Seemingly someone else had the same idea, as seen in this photo (the only one of this thing I found after 1/2h of searching):
Yes, what I saw looked quite similar (but not the same..)
What puzzled me though was that mount threads at the body perpendicular to the optical axis and that accessory shoe. Both anything but typical for a CRT-camera.
Edit:
I found a CRT-camera that got threads in such position...
no, I don't think so. polaroid used these bodies for different purposes. in the beginning it was for dental cameras and close-up museum work. they also sold them for criminal investigation work. with the help of the above mentioned finder and the 5" lens you could just make a close portrait of a suspected person.