Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - 1910 (September 28), black-and-white PPC (two Curtiss Machines in Flight near Hempstead, NY), sent from Mineola, NY, franked by Franklin 1c green with perforation 12, mostly VF, Est. $120-$150, Sc. # 331