Hogan's 1Iron from Merion was lost...stolen..whatever... and ..later recovered by a guy here in NC...One of the PGA pro's in the area...actually hit a few with it before it was returned to Mr. Hogan...He said the grips were very long...and were sewn from what appeared from the inside with a rib....he also quoted "Only seen a wear spot like that on a short iron the size of a nickel ,toward the heel....never seen it on a 1 Iron"...as he snickered...
You are clearly a Hogan student, so I think you would really enjoy "Afternoons with Mr. Hogan" by Jody Vasquez. He publishes Hogan's specs (length, loft, lies) and confirms Brian's comments re: the reminder grip and the way open clubface.