cover 1878 (19 Sept.) envelope, with original enclosure, to the U.S. Consulate, Shanghai, redirected to Hankow, bearing 1863 CC 4c. pair (one damaged) centrally cancelled by clear "S2" in black with Swatow c.d.s. alongside and showing, on reverse, "SHANGHAI/LOCAL POST" d.s. in blue and Shanghai c.d.s.; the envelope with some damp staining, mainly at left. Photo