Ireland 1929, US incoming line to the first flight Galway - London, letter from Boston 15.8.29 to Sutton Coldfield, with steamer "S. S. Karlsruhe" to Ireland with on face green flight vignette "Airmal Karlsruhe - Galway" and appropriate forwarding mark, in Sutton Coldfield at the 27.8.29 postage stamps added with 1 / 2 P, superb