Someone on this site collects Hogan 1 or 2 irons. Can’t remember which. Just saw their post the other day. They may be able to help.
Just a note, neither my Precision or Power Thrust set has a 1 iron. I would think that they would have had them as a special order for those who wanted them since the 1 iron was much more common then as compared to now. Probably not a lot of them floating around though.