Mexico, 1861, 4r black on yellow, Tula, without gum, large margins all around, small natural pre-printing paper wrinkle, Extremely Fine, only known unused with only three examples recorded, another copy was sold years ago for $2,000, a true rarity of the issue; with 2015 MEPSI certificate. Scott Nos. 9  Estimate $1,500 - 2,000. $0 (Image)