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Immediately after the proclamation of the Independent State of Croatia, the Ustaša headquarters in Banja Luka issued a definitive stamp issue documenting their claim to power. They used stamps of 1 and 2 dinars from the last definitive series of Yugoslavia, featuring the portrait of King Peter II. They overprinted stamps with the inscription: “SLOBODNA BOSANSKA HRVATSKA” (“Free Croatian Bosnia”) and distributed them to post offices in Banja Luka.
These provisional stamps were allegedly necessary because the overprinted Croatian issues (Michael Nos. 1 to 8 and 9 to 23) had not yet arrived from Zagreb. This issue was in normal postal use from 19-23.04.1941, but it can be found on the letters sent even after stamps from Zagreb arrived. On June 17.06.1942. The government recognized these stamps as a valid local issue.
Stamps are printed in quarters of a normal sheet, so, in 25 stamps.
| Mi 1 | 1 Din | green | 1000 issued |
| Mi 2 | 2 Din | lilac-carmine | 1000 issued |
Typographical Error
There is a big error in overprint in position 23 where letter “o” in “Bosanska” is replaced with letter “a”, so in the overprints we see word “Basanska”.
