US Mail (11629715673)

Art Deco letter box in the lobby of the Koppers Building, Pittsburgh. The letter box is designed to look like the Koppers Building - complete with the distinctive pitched roof design on top.

From Wikimedia Commons (Art Deco › Art Deco by medium › Art Deco decorative and applied arts › Art Deco letter boxes). By David Brossard. CC BY-SA 2.0.