In 1940 Spratling was commissioned to design the first logo for Aeromexico Airlines then known as Aeronaves de Mexico S.A. The design included a stylized eagle with serpent in its' beak along with AMSA. Penny Morrill's beautiful new book DREAMING IN SILVER (p.111 & 123)discusses this period and features the deeply carved and detailed pin based on Spratling's AMSA design. Measuring 1 1/4" X 1 1/4" the pin is in beautiful condition. The unusual pin closure/safety on the back is tight and secure.