1851 (Sep. 30) Bremen to Baltimore, Md., folded letter with "Bremen 30/9" double circle postmark struck twice and matching "Franco" straightline, Prussian red manuscript "1/4" 1s4d credit to G.B., red London Paid (10.3) transit, Liverpool "5/Cents" debit h.s. to U.S., carried by Cunard Line America from Liverpool Oct. 4 to Boston arriving Oct. 17, "Br. Packet, Boston, 17 Oct" exchange cds, Very Fine. Estimate  $150 - 200. Letter sent in closed mail bag through Ostend, Belgium to London under Anglo-Prussian Convention, then by British open mail and British packet to the U.S. Liverpool marked 5¢ debit to U.S. for reasons unknown. Two covers from France are known on this same voyage with the "5/CENTS" marking in black also. Boston used this "5/CENT" marking in place of a postage due marking since the postage due was also 5¢. $0 (Image)