Gary,  I just picked up a "Red Raven" M-3/4 this week, and was quite
surprised to see your request.  But the one I have (copyright 1956)
is made of cardboard, with metal rings on the outside edge and inside
hole, and is 6-1/2 inches in diameter.  The movie picture covers the
entire surface (moving pictures in 3 or 4 rings), laminated with a
clear playing surface.

Can you describe more fully the purpose/action of these records?
I assume that there is some additional mechanism to view them
properly -- mirrors?  Can these be found?

Todd Augsburger
Kenton, OH
allmax@bright.net