Sweden. Foreign-related cover. Denmark. Unpaid NEAR ZONE letter dated "Helsingborg den 26 Sept 1866" mailed in the letter box onboard a ship to HELSINGØR 27.9.1866, with early usage of the FRA SVERRIG mark (used from 1.8.1865). Arrival pmk KIØBENHAVN 27.9. Postage due notation "8" (Danish riksmynt). Scarce and superb.