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You are right, they are Yugoslavian. The Kingdom of Yugoslavia existed from 1918 until 1941. Serbia was part of it, but not as a separate country.
Actaually these also might be of the Vazduhoplovstvo vojske Kraljevine Jugoslavije.
There you goMoskito-jagd. A friend and I interviewed 2 members of 10 (N). /JG 300 when hunting Mossies in the AS equipped craft. A couple members later went over to Kommando Welter and the 262.View attachment 708013
I've always been and always will be amazed by the amazing color profiles that Claes has done. Thanks for posting, Erich!Moskito-jagd. A friend and I interviewed 2 members of 10 (N). /JG 300 when hunting Mossies in the AS equipped craft. A couple members later went over to Kommando Welter and the 262.View attachment 708013