12c Black, E. Grill (90).
Clearly-defined grill, tied by red grid
cancel and matching "Baltimore Md. Dec. 21" (1870) circular datestamp on cover to Rio de Janeiro, Brazil,
red "New York Dec. 24" circular datestamp, blue boxed "Franca" handstamp, receiving backstamp, stamp with small tear at top, otherwise Very Fine, a very rare use apparently underpaying the 15c treaty rate by American Packet from New York, but accepted as fully paid, one of only two recorded Baltimore foreign mail covers to Brazil,
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