Sweden. Foreign-related cover. Norway. Official letter sent from PITEÅ 10.4.1843 via the rarely used mountain mail route via Haparanda, Karesuando and Mauno, to Tromsø 8.5.1843. The letter has been forwarded, mostly by sledges drawn by reindeers, more than 500 km through a waste without real roads during almost one month! Free letters were accepted both in Sweden and Norway. Important international EXHIBITION rarity in superb condition. Ex. Nilsson.