I collect E98s and used to have a couple of Old Put printing stamps on the back of some but now I wouldn't touch an Old Put card with a ten foot pole after a fellow collector showed me a fake he made which looked identical to the ones I have seen.
Another thing which isn't really being mentioned is the seller on ebay who sells slabbed T206s with red backgrounds and never mentions the color variation anywhere but the scan looks very, very orange and then when you get the actual card it is a red background just like the rest. Fool me once shame on you, fool me twice......
