used Block of Four 9kr. blue, a magnificent block of four showing mixed types, three Types IIc + one IIb, with good to large margins (3mm. sheet margin at right) and neatly cancelled by "GRATZ/6. SEP." d.s.; 2mm. scissor cut in margin at foot is mentioned for the sake of accuracy. Rare and exceptional. Ferchenbauer Certificate(1980), signed G. Bolaffi, R. Mondolfo. Cat. ÖS 90,000. Photo in colour.