I have a T206 American Beauty with a bluish back. I believe it was something that was used to remove it from a scrapbook. Plus under a microscope, nothing else matches that shade of blue. My Blue Old Mill looked like an exact color match to a Polar Bear, until I put it under a microscope and compared other card backs and found an exact match with a Piedmont 150 Blue. You really need to compare the pigment under high magnification.
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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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