50 Groschen and 3 Shilling airmail stamps in mixed franking on Zeppelin postcard, 1. America flight, Innsbruck Friedrichshafen New York, cancelled "INNSBRUCK 2 -7. V. 29-8", on route passing cancellation Friedrichshafen airmail, cancel 1. America flight, as well small single circle postmark arrival postmark New York, very fine