1870, 90¢ carmine, Double Grill. Clear showing two distinct grill impressions, neat corner cork cancel, rich vibrant color, F.-V.F., an extremely rare 1870 National Banknote grill issue variety, variety listed but yet to be priced in Scott; with 2002 P.F. certificate. Scott No. 144  Estimate $4,000 - 6,000. $0 (Image)