(Japanese Post Offices) 1878 (Sep 11) cover to Conn., USA franked 1876-86 Koban 5 sen brown top marginal cancelled by crossroads cork, I.J. Postal Agency Shanghai cds alongside, good strike of rare double-ring violet Yokohama Japan of Sep 21, redirected upon arrival with Greenwich cds top left, reverse with San Francisco transit (Oct 11). A fine cover.