Zepplin Airmail  - 50c Issue on cover with Providence Oval cancel
The Baby Zep is known to have been issued  in four cities:
New York, NY 10/2/33      Akron OH 10/4/33
Washington, D.C. 10/5/33      Miami, FL 10/6/33
and Chicago, IL 10/7/33
The Akron, OH cancel catalogs at the highest value
Covers Actually Flown on a Zepplin Command a Premium