LZ 127 Graf Zeppelin carried not only scores of passengers but also tons of mail. Zeppelin postcards and covers were prized by collectors from the first day. It's not a secret that thousands of letters were delivered (and usually returned to sender) only for sake of a special postmark or two.
During the Golden Age of Zeppelin lots of theme stamps were issued not only by German Mail, but also by the states that never had a dirigible of their own, like Liechtenstein, Iceland or Finland. Here they are, in color, properly marked. Delivered by the noble Graf: