Los-Nr. 6750

"2 Rdr. 6 Sk." Postage due charge mark on unpaid double rate letter sent December 17th 1856 from Malta via Marseille, Paris, Hamburg and Helsingborg to Carlskrona. The normal double rate was 1 Rdr 20 Sk, by mistake the postmaster charged the triple rate, stamped 2 Rdr. 6 Sk., and the addressee overpaid 34 Skilling banco. This is the only known letter with this charge mark.