The Independent state of Croatia was established in parts of occupied Yugoslavia on 10 April 1944, after the invasion by the Axis powers. Its territory consisted of most of modern-day Croatia and Bosnia and Herzegovina, as well as some parts of modern-day Serbia and Slovenia, but also excluded many Croat-populated areas in Dalmatia (until late 1943), Istria, and Međimurje regions (which today are part of Croatia).
Michel 150 to 153 "Postal and Railway Employee's Relief Fund"
Issued 3rd Feb 1944. Stamps issued to raise funds for postal and railway employees, printed on unwatermarked sheets (3 x 3) and perf L 11¼.
Michel 158 to 160 "Third Anniversary of the State of Croatia"
Issued 22nd May 1944. Stamps issued to comemmorate the third anniversary of the Croatian state, printed on unwatermarked sheets (4 x 5) and imperforate.
Issued 22nd May 1944. This stamp features Jure-Ritter Francetić, the same as Michel 160 but now with changed value and color. Printed perf L14½ on sheets (5 x 6).