Cape of Good Hope 1876 Lovely Incoming Letter from America

1876 SPECTACULAR INCOMING LETTER from America: Franking of 1873 12c blackish violet horizontal pair with 1873 3c green, all tied by "New Haven Conn. Feb 8" duplexes on Landfear correspondence cover to Cape of Good Hope, red "New York '1.10' Feb 9" exchange credit cds, red London (2.21.76) transit and Wellington (3.21) arrival cds; minor imperfections, F-VF, most attractive.