Lot
1221 
1917, 1¢ green, imperf between, three horizontal pairs in a right margin plate block of 15 (positions 57-58, 67-68 & 77-78), o.g., never hinged, P.O. fresh with rich deep color, Very Fine and choice, one of the Finest Plate Block Format Multiples of the 1917 1¢ Imperforate Vertically Between Variety; with 2013 P.S.A.G. certificate. Scott No. 498b $4,050 for three pairs.