I have kept a lot of stuff over the years (red/white foul marker, etc.), but I probably gave away the old plastic ‘phone dial’ style clips we used in my earlier years. I don’t exactly remember, but I guess they had 10 dial holes, with yard line numbers printed at each hole (5 yard increments). The holes were large enough to let the clip hook (on a chain) pass thru the appropriate hole, and then hook to the clip. Slightly easier than having a double clip hook, and un-hook/re-hook to the dial (before or after clipping to the chain). Then, somebody invented the far-more-convenient rotating dial clip that is most common today, making the phone-dial style a relic.