Fred,
I understand that one of the old molds that Potter sold to SeaCraft Industries when he went bankrupt had a hook in it.
He supposedly told them about it and advised them not to use it, but the 23 in above picture that I looked at had the hook in it, I believe in the center panel on port side, so that mold was evidently used anyway. Don't know if any of the subsequent manufacturers used that mold. Denny