The American Air Mail Catalog number for this one is Z-72. It is one of the more common Graf Zeppelin covers and it is the most common leg of this flight with a total of 23,946 flown from Lakehurst, New Jersey to Friedrichshafen, Germany. This one did not fly all the way around the world, it was just from New Jersey to Germany. There are covers that did fly all the way around the world and ones that were flown between the various stops along the way including Tokyo, Japan and Los Angeles, California. There are also covers that were dropped overboard at Berlin, Danzig, Konigsberg, Irkutsk, Porrentruy, and Basel. There are also covers that had their stamps canceled on board the Graf Zeppelin in the tiny post office that was on it where a special on board cancel was used.
Because this example does not have the more desireable Lakehurst, New Jersey cancelation, and because there are no stamps with much catalog value you can buy ones just like on
ebay all day long for $15.