1943 (7 June). Famous Croats (Katarina Zrinska, Krsto Frankopan and Petar Zrinski). COLOUR TRIALS. 1K blue-black + 1K blue-grey, 2K dark olive-black + 2K black-grey and 3.50K red + 3.50K dark brown-carmine, IMPERF. Superb mint never hinged horizontal pairs. Prof. V. Ercegovic, ”Hrvatska filatelija”, mentions additional shades and the new edition of the Dr. Rommerskirchen manual 8P. Hughes ed.) records another shade of the 3.50K value. Michel cat. €600. scarce. SG82/84)