This series was issued on 13 September 1943 to commemorate the 3rd Philatelic Exposition in Zagreb, which opened 8 September 1943.
The stamps depict the Old St. Mary’s Church and Cistercian Monastery, in Zagreb.
MiNr. 115 and 117 were printed in 4×10 sheets. MiNr. 116 was printed in a minisheet.