cover KARLSBURG: 9Kr. (MP) very fine on 1858 registered E.L. to Vienna via Klausenburg, tied by "KARLSBURG 30/8" single circle d.s. in red, showing "RECOMMANDIRT" h.s. also in red (Ryan Type 14, 400p.) and manuscript annotation "erga Retour Recepisse", the adhesive paying registration has been removed from the reverse. A rare and outstanding item. Signed Ferchenbauer. Ryan 673, R. Photo in colour