1. South America Flight 1931, rear till Rio, cover from Hamburg 23. 8. with MOPHILA meter cancellation and postal stationery imprint "000" as well exhibition special cancel 24. 8. and reverse pneumatic post transit Hamburg Ellbriefe with time "3--", in total 4 RM postage with 1 Mk airmail and 1 RM Zeppelin in unusually mixed franking, via Berlin 29. 8. with connection flight to Friedrichshafen with arrival Rio 4. 9., both flight stamp on face, interesting variety, in spite of custom traces a very scarce document!