Hawaii, Oahu College, Honolulu, H.I., corner card on cover to Boston, Mass. bearing 1899, 1¢ dark green and 2¢ rose pair, tied by "Honolulu, H.I. Sep 18 1899" duplexes, purple "T/25 Centimes" handstamp (MH unlisted), black "U.S. Charge to Collect 10 Cents" handstamp and U.S. 10¢ postage due added, tied by Boston cds; slight opening flaws at right, a Very Fine and interesting use. Scott No. 80, 81  Estimate $300 - 400. $0 (Image)