Switzerland: 1929, world round flight, Friedrichshafen - Tokio, letter from Basle 12. VIII. With multiple franking 1 Fr. Airmail (5) to Tokio with on face machine postmark of office or arrival, superb (Si.30Aa) (Image 1) (Image)

Liechtenstein: 1930, South America flight, handing in for transport Friedrichshafen to Recife, letter from TRIESENBERG 15. V. With good franking (among others Michel-no. 55-60 and 71) and all postmarks, addressed to Triesenberg with arrival postmark, superb (Si.57M) (Image 1) (Image)

Liechtenstein: 1930, fligth with landing to Bern and Basle, card from TRIESENBERG 11. X. With airmail stamps and special stamp from Bern and Basle, addressed to Geneva, superb, better variety with both special cancellations! (Si.94) (Image 1) (Image)