Here are some Wilson a2000 glove coasters that I picked up about 4 years ago.
The coasters are about 5 inches at the widest point, and are made out of leather, with a plastic foam back.
Have you ever re-laced a Wilson Catfish Hunter A2005? If so, you know that the padding, or should I say, lack-there-of, is made up of a plastic foam material, which feels like the stuff on the back of the coasters.
I am not sure how old they are, but I am thinking that they may be from the early '60's.
Let me know if you have seen this type of item before.