I think the one with three holes may have been from the Shimano platform pedals from the early and mid'80s. I have the 600EX from my Trek 610 of 1984 and a 105 of similar vintage. If I recall, steel ones were for the 6xxx and 5xxx, while the 7xxx used an aluminum toeclip.
Last edited by Road Fan; 07-10-21 at 05:26 PM.