Sweden. Foreign-related cover. Germany. Unpaid letter sent from WISBY 28.2.1866 by the steamer "Polhem" to Västervik, then by mail coach and by train to Malmö, then via Lübeck to Rostock, Mecklenburg-Schwerin. Cancellations e.g. SÖDRA ST.BANAN 5.3.1866 and LÜBECK LAUENBURG 6.3. Postage due notations "6" (sgr) and "9¾" (Mecklenburger schillinge). EXCELLENT.