Czechoslovakia 1918 Hradcany 20h imperf proof block of 4 in turquoise doubly printed with 5h in green, on ungummed buff paper, as SG 5 & 7
Czechoslovakia 1918 Hradcany 20h imperf proof block of 4 in turquoise doubly printed with 5h in green, on ungummed buff paper, as SG 5 & 7