The first commercial use of the First Šibenik Issue known to me is from the 21st of September 1943 ...
Fragment of stationery hand overprinted with First Šibenik Issue cachet and franked with two 50 cents stamps of the First Šibenik Issue, cancelled by "SEBENICO / RACC. ASSIC." canceller on 21.9.43. Early usage! From well-known Novak correspondence. Certificate Vilfan.
The dry strike on the stationery is almost invisible. However, you can clearly see the overprint using the proper colour separation technique.
