Third Reich Labor Day MiNr. 745 This stamp was issued on 30 April 1940 to commemorate Labor Day, 1 May 1940. Set Date(s) 30 April 1940 Watermark(s) None Album Page(s) Labor Day MiNr. 745 This stamp was issued on 30 April 1940 to commemorate Labor Day, 1 May 1940. Set Date(s) 30 April 1940 Watermark(s) None Album Page(s)