US C13-15 Graf Zeppelin Stamp Set

FVF NH Set of three Graf Zeppelins with fine to very-fine margins. All stamps fresh with good color. The stamps were issued for the visit of the Graf Zeppelin at the Chicago World's Fair. They paid for postcard and letter one-way and round trip aboard the Graf Zeppelin on its voyage to South America and back to Germany. May have small natural gum skips or bends.