WWII Occupation - Serbia Airmail Overprints MiNr. 66 MiNr. 67 MiNr. 68 MiNr. 69 MiNr. 70 On 5 July 1942, Serbia issued this set of airmail overprints of the Yugoslavian King Peter II issues. Set Date(s) 5 July 1942 Watermark(s) None Album Page(s) Airmail Overprints MiNr. 66 MiNr. 67 MiNr. 68 MiNr. 69 MiNr. 70 On 5 July 1942, Serbia issued this set of airmail overprints of the Yugoslavian King Peter II issues. Set Date(s) 5 July 1942 Watermark(s) None Album Page(s)