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warshawlawHigh grade cards sell very well. Do not expect to find PSA/SGC 7 and up cards often and expect to pay into three figures for them.
The sets are actually much more complex than people usually give them credit for, especially if you are interested in master sets or variations. T220 has silver bordered cards that are very tough to find and Tolstoi backs. T218s have Mecca, Hassan and Tolstoi brands and variations in factory and series number.
T220 has several keys, including Sullivan, Corbett and Dempsey. T218 keys also include Stanley Ketchel, Joe Gans and Abe Attell in addition to those listed above.
For the rest of the details, you have to read my book.