Auction # 2503 ARGENTINA: Special February auction

Cover franked with GJ.50 cancelled SAN MARTIN - Bs.Aires - 28/MAR/1879, sent to USA, on back it bears transit marks of Buenos Aires (very rare purple datestamp!) and New York, and Cincinnati arrival (on front) along straightline "FORWARDED". It contains a letter with letterhead of Ferro-Carril de Buenos Aires y Campana, excellent and rare!