1930, cover with good franking (amongst other things 3 items Michel-no. 107) from TRIESENBERG 6. XI. 30 via Friedrichshafen with DOX on board confirmation mark from 30. January 31 and best. Postmark as well on the back transit cancellation "Rio 22. IV. 31", addressed to Zurich, 1 value with short tooth, otherwise perfect, superb