Yugoslavia, Kingdom. An Army Air Service Observer's & Navigator's Badge, by Karnet-Kisely

Silver, marked "900" (silver), maker marked "KK" (by Czechoslovak manufacturer Karnet-Kisely) and with very low number stamped "15" on the reverse, 50.3 mm x 66.3 mm, dual screw-backs (one retaining nut missing), light contact and surface wear, very fine. A scarce badge.