1864 (Feb. 17) Bristol, England to St. Louis, Mo. via Chicago, cover with "Bristol FE 17 '64" cds and "6/Cents" debit exchange handstamp, carried by Allan Line Damascus from Londonderry to Quebec, blue "Chicago Am. Pkt. '48' Mar 5" exchange cds with matching "70/U.S. Notes" depreciated currency handstamp; repaired opening tears, Extremely Fine appearance. Estimate  $500 - 750. THIS IS THE ONLY RECORDED EXAMPLE OF THIS UNLISTED 70 U.S. NOTES CHICAGO DEPRECIATED CURRENCY MARKING. London sent Chicago mails on Allan Line steamers from Londonderry to Quebec. Letter carried by train from Quebec to Chicago for exchanging. $0 (Image)