On April 19, 1930, three special airmail stamps, the Graf Zeppelins, were made available for sale to be used exclusively on mail carried via the Graf Zeppelin on its European – Pan American flights the following month. In the 1920s, many nations became aware of the commercial possibilities of transoceanic flight. However, there was only one company willing and able to initiate this service – Germany’s Luftschiffbau Zeppelin. Even today this firm’s ventures seem daring and visionary.