1840, UNICORN: Maiden Voyage, Folded letter dated "Leith 28 Apr. 1840", privately carried to Liverpool where it was placed in ship's letter bag, endorsed "p. Unicorn Steamer", with red "BOSTON SHIP JUNE 4" with red manuscript charge "27" (25c for inland postage, 2c. ship fee), extremely fine and rare, marking the Inauguration of Cunard Line Service
