I love the premise behind your question. It shows an appreciation for the game and some of it's history. But honestly, aren't you probably reaching a part of your life where you want to win as much as you can? I'm not saying you can't do it with an old players racquet, but wouldn't it make more sense to get the best racquet possible for your game? Odds are its not an old school 85 sq.in frame.
But if you're dead set on playing with something old, I've got a 13 year old Wilson Pro Staff Classic 6.1 with 4-5/8 grip in great shape I'll just give you. I didn't use it much befor switching to the N/K6.1 for the next decade because they made some noticeable improvements to them.