cover 1881 2Kr. bluish violet (2) applied together with revenue 1Kr. on reverse of 1885 (9 Apr.) cut-down "mourning" XU5 to Aszód (redirected to Zólyom), cancelled by "NAGY-KÁROLY" c.d.s., manuscript "6K" applied on address panel to show the 5 Kreuzer inland postage due (+ an additional 1 Kreuzer for the missing fee). Highly unusual, showing the illegal usage of a revenue for postal purposes. Very rare. Photo in colour