Treasury Dept., 1873, 3¢ Brown, tied by cork cancel duplexed with "Troy N.Y. Jan 26" cds on cover to Schenectady N.Y., pencil "3c Due", Schenectady added 3c postage due (J3) cancelled by target, clean and Very Fine, a rare and interesting Official postage due use; with 2012 P.F. certificate. Scott No. O74  Estimate $500 - 750. Since there is no corner card on this cover, the post office could have charged postage due for illegal use of a departmental stamp. Or the post office charged postage due for double-weight letter. $0 (Image)