[The following excerpt is published courtesy of DLRC Press and its author, John Feigenbaum. This information was originally published in 1994 in The Complete Guide to Washington Quarters.]
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1. The values listed under 1949, 1964, 1979 and 1994 are from the 3rd, 17th, 32nd and 47th editions of “A Guide Book of United States Coins” (also referred to as the Redbook), a popular retail price guide. CDN values are bid (wholesale) figures from the November 1993 issue of the Coin Dealer Newsletter Monthly Supplement and January 28, 1994 issue of the Coin Dealer Newsletter.
2. Breen numbers listed are from “Walter Breen’s Complete Encyclopedia of U.S. and Colonial Coins.”
3. FS numbers listed are from Bill Fivaz and J.T. Stanton’s “The Cherrypicker’s Guide to Rare Die Varieties,” third edition.
4. Total MS/Proof PCGS/NGC refers to the total number of mint state/proof coins listed in the October 1993 PCGS Population Report and July 31, 1993 NGC Census.