1851, 12¢ black, very thin paper, neat red grid and town cancels, large to huge margins encompassing portions of adjacent stamps on three sides, sharp proof-like impression, Superb, truly spectacular and without doubt The Finest Known Example of the 1851 12¢ Washington Issue on Very Thin Paper; with 1989 and 2010 P.F. certificates for pair and 2012 P.S.E. Graded certificate (Superb 98, SMQ $2,800 or normal #17 which only catalogs $260). Scott No. 17 var.  $1,780. $0 (Image)