1913 (Sept. 22-27) Driving Park Aviation Meet, Helena, Mont., picture post card franked with 1¢ Washington (natural s.e.'s) tied by red "Aeropost, Helena, Mont., Sep 24, 1913" postmark, reverse showing "Katherine Stinson, Aviatrix (Wright Biplane)", with message reading "Am sending you this card from fair grounds by aeroplane mail carried by girl in machine to post office", Very Fine and choice, a historical flight as this was the First Time Official Mail Was Flown By a Women. AAMC $1,500. AAMC No. 75. $0 (Image)