World War II Patriotic cover
The pen-and-ink cachet design by L. I. Olsen features the B-17 Flying Fortress plane ... see the glass-and-metal observation nose cone and the gun turret projecting from the underbelly. A large American flag and cumulus clouds are in the background. [Lawrence Sherman refers to a similar design on colored envelopes by Matthew J. Huss.]
A one and a half-cent United States Scott 805 is affixed. The cover is postmarked Chicago 40, Illinois; date unknown.