1842 (Mar. 11) Buffalo, N.Y. to London, England, blue Mar. 11 oval datestamp with matching fancy "Paid" handstamps and manuscript "25" rating, originally endorsed for Cunard Line Columbia, but carried by Cunard Line Unicorn departing Boston Apr. 2 and mail transferred to the Columbia that returned Apr. 20 by sail, red London (4.21) arrival backstamp and manuscript "1/2" 1s2d due rating on flap; cover toned, Fine and very rare sailing, ex-Pullin. Estimate  $300 - 400. "Columbia" arrived at Halifax under canvas, having broken a shaft about 450 miles from Halifax on her Mar. 4 sailing from Liverpool. Her mails were transferred to Cunard auxiliary steamer "Unicorn" who carried them to Boston, this letter caught the return sailing to Halifax where the mails were transferred. $0 (Image)