Auction 333-341 Nigeria, Cameroon, Sudan & Worldwide Postal History - Day 4

1851: 12 c. black, plate 1, two horizontal pairs, good to large margins except the right pair touching along the left frame line, tied to undated cover to London by Philadelphia cds and red "Phila Am Pkt 6" exchange mark, manuscript "Steamer Pacific" at upper left, both pairs with small marginal flaws, some overall light creasing, otherwise very fine and eye-catching.
Provenance: Collection Erivan Haub, H.R. Harmer, 22 July, 2019, lot 16; collection Judge Robert S. Emerson, Daniel F. Kelleher, Sale 439, 1947