Proprietary, 1873, $5 green & black, violet paper, full o.g., well centered, especially for the oversized issue, rich deep color, Extremely Fine, an exceptional mint revenue rarity, ex Kingsley (R.A. Siegel Inc. October 8, 2003 sale where it realized $23,000 hammer); with 1981, 2003 & 2011 P.F. certificates. Scott No. RB10a  $11,000. THE ONLY SOUND ORIGINAL GUM EXAMPLE OF THE $5 PROPRIETARY ON VIOLET PAPER. This is one of only three sound mint examples of this high value Proprietary issue and the only one retaining it's original gum. $0 (Image)