WWII Occupation - Croatia (NDH) Labor Day MiNr. 178 This stamp was issued on 1 May 1945 to commemorate Labor Day. Stamps at position 62 of some sheets can be found with a plate flaw. MiNr. 178 I MiNr. 178 I (right) The stamps were printed in 10×10 sheets. MiNr. 178 Sheet Set Date(s) 1 May 1945 Watermark(s) None Album Page(s) Labor Day MiNr. 178 This stamp was issued on 1 May 1945 to commemorate Labor Day. Stamps at position 62 of some sheets can be found with a plate flaw. MiNr. 178 I MiNr. 178 I (right) The stamps were printed in 10×10 sheets. MiNr. 178 Sheet Set Date(s) 1 May 1945 Watermark(s) None Album Page(s)