Posted By:
David SeabornJeff,
I follow these things religiously and can tell you the actual values for PSA/SGC graded T206's (as well as others). In some cases the guides are way off or simply do not cover the grades in which you are interested.
Here is a sample. To keep it simple, let's take all the listings for all T206 commons with only a Piedmont back (without qualifiers) that have been sold at auction. This include eBay, Teletrade, Lew Lipset, Mastro, BaseballVintage, Superior,SportscardsPlus, and 19thCenturyOnly.
Since January 1, 2003 there have been 22 PSA/SGC 7's offered individually for sale. Their average price was $248.84. There have been 18 PSA/SGC 8's offered individually. Their average price was $702.82. Their has been one PSA/SGC 9 offered individually. It was sold for $2789.90.
Hope that helped.