Here is a wonderful set of used Zeppelins, Scott C13, C14, and C15. No faults of any kind, and good color on all stamps. Please note that I have collected stamps for many decades and know a thing or two about them. The item "US C13-C15 XF used Zeppelin set" is in sale since Sunday, January 6, 2019. This item is in the category "Stamps\United States\Back of Book\Air Mail". The seller is "hawker1919" and is located in Darien, Connecticut. This item can be shipped worldwide.