Revenue, 1862-71 First Issue, 5¢ Foreign Exchange, plate proof on card, experimental overprint, Turner type III, of seal reading "United States Internal Revenue" in corners, even margins, intense colors, bottom right corner thinned, Extremely Fine appearance, possibly the unique example, ex Brazer and Joyce. Scott No. R26P4 var.  Estimate $500 - 750. $0 (Image)