Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - Pioneer Flight - 1911 (October 4), First Flight postcard (Observation Tower near St. Louis, MO) from Aeroplane Station No.1 at St. Louis, franked by Franklin 1c green with straight edge at left and perforation 12 on three other sides, mostly VF, Est. $200-$250, Scott #331