1868-1876 U.S.-Great Britain Mails by Steamship (1867-GPU Treaties), group of 12 stampless covers including 1868 Cuba to London via New York, 1869 N.Y. to London with large "8d" due rating (unpaid letters uncommon), 1870 Cuba to London with black "1/" due rating (first recorded strike in black), 1874 N.Y. to Spain via England, 1872 London to N.Y. prepaid 3d in cash, and two 1875 London to Richmond prepaid 2½d in cash, Very Fine. Estimate  $300 - 400.Complete images: View gallery or Download PDF (1.3MB) $0 (Image)