In February 1943, the Partisans occupied the town of Imotski. After their withdrawal, the post office remained without a canceller, so it was forced to use a temporary provisional rubber postmark "POŠTA —IMOTSKI" for a couple of months.
1943 Imotski, registered letter sent from Imotski (handwritten 31.3.43) to Roma (13.4.43), correctly franked with 13kn (4kn for mail to Italy and 9kn for the registration), porto used as franko, cancelled with a temporary provisional rubber postmark "POŠTA - IMOTSKI". This is the earliest known date and one of two known letters sent abroad.
