Los 431
CUBA-ARGENTINA: 1871, Lettersheet docketed "Matanzas agosto 16 1871", addressed to Buenos Aires, prepaid with US 1870, 10 c. brown for the USBMC steamship rate, "FORWARDED BY J. NILES & Co. ST. THOMAS W.I." and posted at "ST. THOMAS 1 10 1871"; on front rated "2/4" (pesos/reales) in blue crayon. A fine and rare ship mail cover, one of 3 USBMC letters with only US stamp
