Posted By:
warshawlawI have to be cynical about the very high grade T206 cards. They are true condition rarities. Altered "high grade" stuff is a very big problem. I would rather have a vg-ex collection than a nm-mt collection for that reason.
As far as valuation for trade, I do not think you can set an approximate ratio because of how scarce truly high grade material is; it virtually has to have an auction to set value. I know that I would want many, many times the low grade price for a true high grade card.