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Josh K.Dont know what a reasonable price is, I suggest just getting on ebay and looking at past sales - search "T206 psa 6" under completed listings and it should give you an idea. An SGC 80 is the equiv. of a PSA 6 - most newer sgc labels have the equivilent grade right on them. You can also see the entire conversion scale on sgc's website under "grading scale."