I've been trying to get a better understanding of scarcity also but its hard to track ones online due to either small or fuzzy scans. You can see which ones have been confirmed so far on this checklist.
http://www.t205resource.com/checklistsmaster.html
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Ron - Uncle Nacki
T206 Master Monster Front/Back Set Collector - www.youtube.com/unclenacki
T206 Basic "The Monster" Set 514/524
T206 Advanced "Master Monster" Front/Back Set ?? ??/5258
COMPLETE T206 BACK SUBSETS
Old Mill Southern Leagues - Black Ink 48/48
Sweet Caporal 350-460 Factory 30 Full Color "No Prints" 28/28
NEAR COMPLETE T206 BACK SUBSETS
Polar Bear 245/250
Sovereign 460 50/52
Sweet Caporal 150 Factory 649 Overprint 31/34
Piedmont 350 "Elite 11" 9/11
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