Sweden. Facit 72, 82 used, 2+10 öre as postage due on cover, seemingly posted onboard the airship Zeppelin LZ 120 Bodensee on the return flight from Stockholm to Berlin, then franked with a German stamp and cancelled upon arrival BERLIN 11.10.19 and sent by train and ship to GÖTEBORG 15.10.19. Postage due mark LÖSEN 12 öre. The special letter rate was 30 pf. Interesting and scarce.
