USSR. 1924. SC N 60 2**. Block of four. "Wide five" and "narrow zero".

Block of four, air mail stamps 10 k., green, "wide five", with black typographical surcharge 10. коп. зол./10k. gold, with "narrow zero" variety on top left stamp. Price according to SC catalog is 340000,00 roubles for four series. Only one block of four with "wide five" stamps and with "narrow zero" surcharge variety is known at the present time. Condition: original gum, small area of gum is matt, never hinged, without remarks. Two experts marks of Z. Mikulski on each stamp. Very rare.