30 Kopecks, proof to the postage stamps issue 1941, block of four from upper right corner, on ungummed paper, the right upper stamp with variety \"missing black printing ink\", the proof became in of the first printing period the first issue produced and shows to Eo Vaher the type characteristics 1a, ungummed as produced, expertized Nemvalz, Krischke BPP and Keiler BPP as well expertise Thilo Nagler VP (2023) \"genuine and immaculate. \" - great rarity of the collection areas!