Company prepared stiff card 6x8.5" c. late 1920s holds five designs without inscriptions that would be imprinted as customer desired. Each has W&H backpaper. Inked notes show stock number, prices per thousand and there is a sheet of spring steel to demonstrate option of "chirping button." Sizes are 1.5", pair at 1.25", pair at 7/8". Couple rust dots on card under the buttons but card displays clean and buttons are Exc. and display Mint. The bi-wing plane is exceedingly rare design. A unique carded group.