Where'd that pic come from? Because that looks like a new decal somebody had (or has?) for sale. I was almost sure I'd seen this one from Osborn, but while they do have a bunch of CAP decals, they don't have one just like this. They'd probably be interested in adding it to their line, though; you might send them this pic and see what they say.
I've had this for awhile, just haven't put it on the air cleaner yet. Mine has a number written on the back DD 633 and mudsclassicparts.com out of California shows this still in stock for $18.76