Public auction #42 on

1932/39. Aleksandar 5 d solo frankatura na avio pismu za Pariz sa trouglastim avio žigom BEOGRAD 1 u retkoj ljubicastoj boji i 0.50 d + 1 d + 2.50 d II Avionka na avio pismu iz Maribora za Trier, Nemacka.
1932/39 Aleksandar 5 d single franking on airmail letter to Paris with triangular airmail cancel BEOGRAD 1 in rare violet and 0.50 d + 1 d + 2.50 d 2nd airmail issue on airmail letter from Maribor to Trier, Germany.