red datestamp with matching "29" retaliatory rate handstamp on folded letter from Ireland to New York City, blue "Limerick Se21 1848" origin postmark, Great Britain 1sh Green tied by "303" in grid, endorsed "p Mail Steamer from Liverpool of Sep't 23", London and Liverpool backstamps, very fine, rare retaliatory rate cover from Ireland, 2006 Van der Linden certificate, ex- Boettger