This has got to be one of the the most complicated wheels in our collection. Maybe those in the ciné business would disagree. Part of the difficulty is the size of the type. It is tiny. It must be two or three point type! I can kinda sorta figure out what the front is getting at, but the back is incomprehensible.
This guy is not quite five inches is diameter and is made of a sturdy plastic. It was produced by the good folks at Florman & Babb, a camera equipment company serving the television and film industries. It eventually merged with (wait for it!) Camera Equipment Company to become, I think, F&B/CECO of California. I'm not sure it exists anymore because the CA Secretary of State has suspended its charter.
At at any rate, here it is for you to muddle over.