cover 1879 (April) 5b. carmine error of colour, affixed to 1879 (28 Sept.) 5b. postal stationery card to Vienna (29.9 arrival), tied by "T.SEVERIN" c.d.s.; a few tiny imperfections which detract liitle from this extremely rare item. Accompanied by a similar card from the same correspondence bearing the correct 10b. carmine adhesive. Believed to be one of only two known examples. Signed Holcombe and with Friedl Certificate (1981). M.50F. Photo