1941 D over inverted D Washington quarter ?

I'm looking for a member who has any information on a 1941 D over inverted D Washington quarter .
I have little knowledge on this series and the value or how rare this variety is or isn't . I have spotted one in the raw at a shop. The coin looks to be a ms 63/64 grade . The seller has it priced full retail for a 63 grade. I probably can talk him down a few bucks .
The coin is again an 1941 D RPM -004 D/ inverted D.
Even a link to a site on Washington quarters varieties would be appreciated . Thanks in advance.

 

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http://varietyvista.com/09a WQ Vol 1/RPM Detail Pages/1941DRPM004.htm

 

The only thing I see is a D/D south

 

http://www.doubleddie.com/1237682.html

 

I did some searching and couldn't find anything linked to an auction or, price.
I lost my Red Book, It might have some additional information on the rpm's

 

I don't see any D over inverted D's listed. There are several D/D's listed at the above link though. Do any of them look like the example you found?

 

No the only information on this variety in question that I can find is on Variety Vista . The 004 rpm.