Randomly looking for something else on fleaBay and look at this? Looks like a Capital Plastics holder with a seal?
Usually the more As the better, after all AAAAA+ plumbing comes before AAA+ plumbing in the phone book (back when there were such). Doing some skulking found this lovely snippet:
Seen them, not sure if I have one or not, didn't run across them until after the book came out. I would suspect since they specify different qualities for different "features" it probably dates after 1986 once ANACS began doing so.