Here’s a pretty cool item that Mastro auctioned off in March 2000: a 1969 Topps Test Set Uncut Sheet.
There are nine players on the sheet, including Carl Yastrzemski. However, Topps only used the Yaz image in the deckle-edge insert set that year. The auction description pointed out that the deckle-edge cards use similar black-and-white images with the player’s signatures across the bottom third of the cards, so it’s likely that this heavy cardboard sheet was made in that issue’s preparation. And since uncut deckle-edge sheets show identical card layouts and spacing, it’s possible this one was an early proof.
In an article about 2018 Heritage cards, SABR wrote a few words about these proof sheets, “I discovered that Topps did a test run for deckle edge in ’68 that was never distributed. There are uncut proof pages and singles with blank backs that have blue, black and red autographs. Apparently, Topps wanted to see which color looked the most realistic. By the way, the O-Pee-Chee deckle cards used black ink for autographs. Interestingly, the proof sheets contain nine images, only one of which was used in ‘69: Carl Yastrzemski. The rest of the players (Dave Adlesh, Hank Aguire, Sandy Alomar, Bob Johnson, Claude Osteen, Juan Pizzaro, Hal Woodeschick and Sonny Jackson–who is depicted on the Colt ‘45s) appear to have been randomly selected. Only Osteen could have reasonable been considered a star in 1968.”
For reference, here’s a proof sheet of 1969 Topps Deckle Edge cards, representing two complete 33-card sets, that REA sold in the spring of 2021 for $600.