1867 H.M.S.O. six page publication entitled "CONVENTION BETWEEN THE GENERAL POST OFFICE OF THE UNITED KINGDON OF GREAT BRITAIN AND IRELAND, AND THE GENERAL POST OFFICE OF THE UNITED STATES OF AMERICA", also an eleven page "RETURN" printed by Hansard on Imperial Penny Postage being a "Copy of the fourth letter addressed by Mr. Henniker Heaton, M.P., to the Postmaster General, dated the 1st March 1887, on the Imperial Penny Postage, and the Postmaster General's reply, both measuring 210x330 mm., some minor perimeter faults or toning