A Graf Zeppelin flight cover from Buenos Aires Argentina to Friedrichshaffen Germany in August 1934.
The Graf Zeppelin made 64 round trips to South America.
1930 = 1 flight
1931 =  3 flights 
`932  =  9 flights
1934 = 12 flights
This route established the  FIRST  Regular Scheduled Commecial Air Service!!

Based on the fact that the envelope was never opened and no contents, it makes sense that this cover was sent to a "Cover Collector"!

The Air Mail Stamp is Argentina C17.    A 2009 Scott Catalogue listed the used price as $10.00.

In my research I've found that 12 flights to South America were made in1934.
Flight #3 went to Buenos Aires, Argentina. It was to test for interest flying to there. But, there was not enough interest shown.
 Thus, a connecting airplane flight from Buenos Aires to Brazil was initiated.
The CONDOR stamp is in Spanish.
The Postage Stamp is from Argentina as is the Postmark indicating that t iwas on one of those connector flights. "CONDOR"!

You can't find a cheaper one, because there are none listed. And I checked the last year of  "SOLD" Graf Zeppelins and there are NONE listed like this one either. 
 If condition matters and history does, then it is....
TIME TO OWN!!

ships from USA.