Serutan
Eatibus Anythingibus
Indeed you can, and even though you sort of took two guesses in one I'm going to give you credit...YES, the team with five entries on the perfect passer rating record list is...THE CLEVELAND BROWNS!!!
The first guy to accomplish the perfect rating more than once was Craig Morton, once with the Cowboys and once with the Broncos, and I'd be surprised if anyone ever guessed him...or even remembers him, really.
I read the hint, and immediately knew it was the Browns. Was Otto Graham one of the five?
I do remember Morton since he was the guy Staubach replaced, and then he got stomped by his old team in the SB.
But I would never have guessed him.