The 1824/2 Quarter Dollar is unique in Proof condition. The coin first appeared in a Capt. John Haseltine sale in 1881, went off the market until 1954, then disappeared for another 30-plus years, sold last in 1993 as an NGC PR63, and has not been seen since. All of the appropriate experts (Breen, Tompkins, Rea et al) recognize this Proof -- now we just need to find out where it is! Thanks to images from the Superior catalogs in which the coin appeared, it should be instantly recognizable because of toning spots and other pedigree markers.