The following information is from Dr. Richard S. Appel's excellent article in the Coin Dealer Newsletter. Dr. Appel is a noted expert on the Washington Quarter Series.
"The 1956-1964 Mulings of Proof Washington Quarter Reverses with Business Strike Obverses: The Creation of the Type B Reverse."
"The Proof reverse design of that era differs from that of the business strikes in a number of striking ways. First, the Proof lettering is more sharply impressed and has flat tables and squared corners and edges. Next, the eagle exhibits both greater detail and relief and appears slightly thinner on Proofs, as compared with business strike examples. Additionally, a leaf extends above the uppermost arrowhead point on Proof reverses. Further, on many specimens some degree of a mirrored field remains evident. Finally, and to readily distinguish a Proof die reverse, the E and S of States are widely separated. This contrasts with business strike specimens where the letters virtually touch one another."
"Presently, few numismatists recognize the existence and significance of the Type B Reverse mulings of the Washington Quarter series. This has kept their prices at low levels. However, as more people become aware of these little known and incredible coins, the demand fro them is likely destined to surge as with their prices"
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