Luftpost
Bulgarien, Michel 240+, Brev
1939. BULGARIA. 1 + pair 2 + 30 L on cover PAR AVION from Sofia 26.X.39 to Linköping, Sweden.
Sverige, Brev
1948. SVERIGE. Cover with 4 stamps from MALMÖ 31.7.1948 33A UNIVERSALA KONGRESO DE ESPERANTO to Sofia, Bulgarien. Several cancels including Retour..
Michel 343+
Sverige, Brev
1929. SVERIGE 10 LUFTPOST + 10 + 5 öre KONGRES on cover STOCKHOLM-KALMAR-STETTIN-BERLIN-WIEN 22 6 29 LUFTPOST. to Braunschweig, Deutschland. Transit cancel BERLIN- ZENTRALFLUGHAFEN 22.6.29. LUFTPOST FRÅN KALMAR.__ Med Luftpost Kalmar-Stettin-Berlin.
Michel 138+
Sverige, Brev
1929. SVERIGE 7/10 + 4-block 12/65 öre Gustav V Medalion on cover STOCKHOLM-KALMAR-STETTIN-BERLIN-WIEN 22 6 29 LUFTPOST. to Sofia, Bulgarien. Arrival cancel SOFIA 24. VI. 29. Several transit cancels both on front and reverse including LUFTPOST FRÅN KALMAR. (Lüning 93A4.) Unusual destination.
Michel 111+
Bulgarien, Michel 249-251, Brev
1932. Luftpostausstellung in Strassburg 10 + 24 + 28 L. ROUSSE 9.IV.32. til Paris, France. Rec.
Bulgarien, Michel 206+208, Brev
1927. 1. POST AER SOFIA 8.XI.927. 1/6 + 4 L AIR MAIL.