1856 (Sep. 30) Hamburg to New York, N.Y., folded letter with "Hamburg/30 Sep 1856" postmark and manuscript "5" cent debit to U.S., carried by Hapag Line Borussia from Hamburg Oct. 1 to New York arriving Oct. 17, "N. York Brem. Pk. '10' Oct 17" integral due cds used since New York did not have a Hamburg cds at this time, Very Fine, One of only four recorded covers carried under the U.S.-Hamburg informal agreement prior to the 1857 Treaty. Estimate  $300 - 400. The 10¢ postage due in New York and 5¢ debit marked by Hamburg suggests an international fee, split equally between the two countries. $0 (Image)