Just found this 1964P
Washington quarter with the TypeB or Type 2 Proof Reverse.
I didn't know these even existed until last night- I was surfing the Net and ended up reading an article by Mr David Lange, NGC Research Director on 6/1/2005.
*HUB GAMES: WHEN PROOF DIES ARE USED TO STRIKE COINS FOR CIRCULATION*
He mentioned in the article the familar ones like the 1992D, 1998,1999,2000
LMC ETC. but further on in the article he mentions about
Washington quarters from 1956 to 1964 currency strikes from the Philadelphia mint are known with either a TypeA or 1 and a TypeB or2
Reverse normally reserved for Proofs.
He goes on to describe that the type B is easily recognized:Letters "ES" in States are separated by a gap, and the overall relief is a bit higher. (ETC)
He also has a nice paragraph about the 1964D also having a Type C Reverse which exhibits very sharp tailfeathers.
Anyway I decided to re-check my Silver Quarters from 56 to 64 and ended up finding a 1964P Type B Reverse Proof!

The first 2 pics are a normal 1964P reverse Type A
The rest are my coin.
Image:
1964PNormalReverseTypeA1jpeg.jpg44.11 KB
Image:
1964PNormalTypeAReverse2.jpg42.91 KB
Image:
1964PObvjpeg1.jpg37.22 KB
Image:
1964PTypeBProofRevjpeg1.jpg46.21 KB
Image:
1964PTypeBProofRevjpeg2.jpg45.98 KB
Image:
1964PTypeBProofRevjpeg3.jpg46.61 KB