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jeffi just did a cursory estimate based on the 1996 SCD listings, which seem to come out to just over 5,000 variations. however, bob did say "pieces" in his original post...maybe he is referring to my projected Old Judge set, which, when complete, will have 2500 "cards," but since 40% of them will be torn in half or in some other way defaced by splitting, there will be a total of 3500 "pieces."
[note: beware baseball card collectors trained in literary criticism]