1873, 30¢ Gray Black, in combination with 1875, 2¢ vermilion, horizontal pair on 1876 cover to Aden, Arabia, canceled by "Phila., Station F, Jul 17" duplex tying pair, postage at 2x the 17¢ German treaty rate with manuscript "German mail" endorsement crossed out and sent in the Italian mails, red "Philad'a, Pa., Paid All, Jul 17" cds, reverse with "Aden Steamer" transit backstamp; 30¢ with some toned perfs and pre-use corner crease at top right, Very Fine. Scott No. 165  Estimate $2,000 - 3,000. A RARE BANKNOTE ERA USAGE ON COVER TO ADEN, ARABIA. $0 (Image)