This just in from Sasa Rakezik:

[Here is an ad from Belgrade's Politika daily. It was published on August 30th 1940, and it advertises Politikin zabavnik, or more precisely the Donald Duck strips which were published in that magazine. The ad says: "Out every Tuesday and Friday... Politikin Zabavnik in each issue brings new adventures by Donal Duck... A single issue costs 1 dinar".]