[painthistorian]

Hi- we sold the card to "Drumback". We have guaranteed this card should be able to grade as authentic by PSA or SGC or you can return card for full refund + return shipping...The back is 100% authentic...I cannot swear card was never previously chemically treated in the past as the card was bought raw in a large lot of T206's. HOWEVER....It does not appear that the other parts of card were affected by any chemicals, as this would affect the entire card such as a bleaching agent. We are positive this card will grade as at least authentic or possibly numerically or your money back, no questions asked. If you need up to 30 days to verify with PSA or SGC, you got it...there is a clear back scan from listing you should also have posted...

We have been in the hobby for 35+ years, I have handled many T206's...the back is authentic, we also have used loupe and examined dot matrix, it is NOT uniform and is similar to any vintage T206 we have handled.

We will ship you and you can get this verified, no risk.