Czechoslovakia 1918 Hradcany 25h imperf proof block of 4 in blue doubly printed with 5h in green, on ungummed buff paper, as SG 5 & 17
Czechoslovakia 1918 Hradcany 25h imperf proof block of 4 in blue doubly printed with 5h in green, on ungummed buff paper, as SG 5 & 17