Amazing cards and research!! Likely not related but earlier in the year, Heritage Auctions offered David Hall's T206 Chance Portrait Sovereign 460. Even though I needed this card, I passed on it because of a pink sort of stain on it. But when I originally saw it back in January, it reminded me of the Tolstoi Pinks.
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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