I must have typed something wrong when I did my initial search on IORR because there's a whole other thread here on this that I found in google. Looks like 999 is right, that it's that Pasche guy.
The Stones had Warhol refine the original by Pasche because they weren't totally thrilled with it. Warhol made it more of a lapping tongue than the one that sort of curled straight down.