USSR. SC N 479 Ра. Imperforation.

Vertical pair of USSR stamps in a series of "Planes", 1 ruble, black, brown, collotype print on thick white paper, without watermark, without gum, imperforated. Pair has margin on the top. Guarantee experts marks in black "F". Condition: without gum, as were released, left margin broken. The picture is not damaged. Without remarks in other aspects. The Certificate of
Mandrovsky. Very rare. Just one sheet was produced and sold through philatelic shop.