1851-1864 U.S.-Great Britain Mails - 1848 Treaty by Non-Contract Steamship, group of 25 covers including 20 stampless, includes covers carried by Inman Line, Hapag Line, Guion Line, Vanderbilt Line, NGL Line and Cunard Line Alps as non-contract, various ship letter due markings including New York, Philadelphia, Very Fine. Estimate  $750 - 1,000.Complete images: View gallery or Download PDF (3.2MB) $0 (Image)