Using of old stationery from the Kingdom of Yugoslavia was permitted for the full nine months after the declaration of an independent state of Croatia (10.IV.1941). Some of the post offices used rubber stamps or other provisional techniques for the identification with the new state. One of the examples is shown below.
1941 NDH Nationalisation, YU Kingdom stationery, properly franked with 2 Din, sent from Požega Slavonska (10.VII.41) to Ronov via Čáslav, Protektorát Čechy a Morava.
Stationery overprinted with the "Država Hrvatska" provisional rubber stamp.