According to a post on the bank’s web site, on 30 May 2014, the Hrvatska Narodna Banka (Croatian National Bank) issued a new 20-kuna commemorative note. The note is like B503, but with DVADESETA OBLJETNICA HRVATSKOGA NOVCA KUNE I LIPE 2014 (Twentieth anniversary of the Croatian currency Kuna and Lipa 2014) on the left side of the banknote, at the position of the watermark, microprinted 34 times in continuous vertical lines, creating a rectangle with some letters and numbers bolded to form number “20” and the inscription “OBLJETNICA” printed in iridescent colour in three lines over the rectangular base.
The Croatian National Bank also produced up to 40,000 sets of uncirculated 10- and 20-kuna commorative banknotes in special folders and sold them for 52 kuna each as numismatic products (BNP501a).
Courtesy of Claudio Marana, Mojmir Cerny, and Zlatko Viscevic.