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Scot Reader (ebay: sreader3)T206 prices are through the roof, particularly for
Cobb Green
Johnson Portrait
Matty Portrait
Young Portrait
About two years ago a Cobb Green PSA 4 / SGC 50 would fetch about $1500; now $3000+. Young Portrait PSA 4 /SGC 50 would fetch about $500; now $1000+. Similar trends for Johnson Portrait and Matty Portrait. Over a two year time horizon I would say your "doubling" estimate is spot-on.
Scot