Shelby Williams Midcentury Wood and Cushion Chair

I have a chair very similar to this one http://www.ebay.com/itm/Vintage-Shelby-Williams-Los-Angeles-CA-Wood-Cha…

Mine is black and walnut and in much better shape than this one ... it's almost perfect with the exception of one small white paint scuff.  The back of the backrest on mine is wood, not upholstery like this one.  This chair is selling on eBay for $39.99, but all of the other Shelby Williams chairs I am seeing online are selling for much, much more, some for several hundred dollars.  Again, the chair in the pictures above is in much worse shape than mine.  Mine is nearly perfect with only one scuff.  The bottom of my chair still has the tag that says not to remove under penalty of the law.  It also says "Physics USU" because the chair was used in a physics classroom at a university.