1875, perforated with small margins 10 c. lilac, tied by cds. "LUXEMBOURG GARE 1 12 86" to lilac double card "Correspondenz-Karte" to Gand, Belgium, with arrival mark; reply part franked with Belgium 1884/86, 10 c. and returned from "GAND (STATION) 2 DEC.86" to Luxemburg. Small transportation marks. A remarkable and most likely unique item. (Prifix IV)
