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MW<< maybe the UZIT 6 would be a bit less then my estimate (35K) and the UZIT 8 would be a bit more than my estimate (60-70K)? >>
Based on T206 sales over the past two years, the multiplier for a two grade increase (PSA 6 to PSA 8) is generally 8 to 10 times. This is true for both "commons" and Hall of Famers. The notable exception would be low-population commons or variations which have a multiplier of 10 to 20 times.
These figures can be verified by making a cursory examination of the T206 listings on vintagecardsprices.com.