Sweden. Foreign-related cover. USA. Unpaid letter dated in "Känsö August 28th 1836", the quarantine station outside of Gothenurg, from the captain of the ship "Molo" to the ship owner in Boston. The black + on the reverse denote the desinfection. Conveyed as ship letter to HULL 11.SE.1836 and as ship letter from Liverpool to Boston. The fee "1" (sh) for incoming letters to UK was paid by the forwarding agent in Hull. Postage due notation "20½" (cent). Highly interesting and unusually early transatlantic mail. Ex. Hugmark.