it appeared to be the clay coated paper of another card stuck to it, probably from storing in a moist environment or humid climate for many years, not uncommon at all to find T206's with remnants of the front of another card stuck to them due to someone pulling them apart when finding them. Usually soaks right off and absolutely looks better. The ever so slightly bright spot is where the excess paper was adhered and did not tone/age as the rest of the 100 years exposed paper did.
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