WWII Occupation - Croatia (NDH) Numeral Issues The NDH issued this set of postage due stamps on 12 September 1941. Set Date(s) 12 September 1941 Watermark(s) None Album Page(s) Numeral Issues The NDH issued this set of postage due stamps on 12 September 1941. Set Date(s) 12 September 1941 Watermark(s) None Album Page(s)