The Spring 1982 issue of Baseball Cards has a great article by Bill Bossert called Uncut Sheets Tell the Untold Story. He shares this incredible proof sheet for Topps’ 1972 Candy Lids test issue in it.
Here’s what he wrote about the set and sheet:
I hope that sheet wasn’t cut up. However, I did find this 1972 Topps Candy Lid Test Proof Willie Mays card that was sold by SCP Auctions for $622 on January 29, 2008.
You can see that Topps printed the Mays card on previously used stock, and there are a few other proof’s out there.