(In a troll's voice) "Looks like a cheap fake to me! The reverse is all wrong! Uggggh...." JUST KIDDING! PF61 is my guess.
Man, this old man's eyes must be going after reading guesses on the lower end. I am not one to overgrade, but I don't see how that is not a 65 at least. Only possible thing I see from the photos is possibly a fingerprint.