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Posted By: Paul

If you consider them to be legitimate sets, there are some very tough Topps test issues from the 60s and 70s that never saw the inside of a wax pack. The 1970 cloth stickers are particularly tough, with only about 1-3 of each known, as far as I'm aware. 1961 Topps Dice Game cards are also quite tough. And Topps almost sponsored a Pepsi set in 1980. One or two of the test sets survived, and Topps has been auctioning off unfinished cards and proofs from this set in recent weeks.