I know the Gimbel's back is more rare than a blank back or a Sporting News back or a Famous and Barr back. But it is still amazing how that card has gone through the roof over the past decade.
A Gimbels Ruth in PSA 5 sold for $12,600 in 2004.
http://www.lelands.com/auction/Aucti...-Gimbles-PSA-5
A different Gimbels Ruth in PSA 5 sold for $29,000 in 2006.
http://catalog.scpauctions.com/lot-6599.aspx