It must have a R Value greater than 6. Heck a general service button in Albert's book, of which there were many thousands or more, has an RV of one. The hard rubber general service buttons carry an RV of 20. I know there must have been way more rubber general service buttons out than there were George Washington buttons like yours. An R value of 6 must be incorrect unless I am missing something.
Disregard this post: I had forgotten that those buttons carry a different rating scale in Albert's book than the others.