Harvard University Fold out Postcard early 1900s

Postally used, unique early Columbia University postcard that folds out to form a Harvard pennant. Early 1900s. The card has a piece that folds over to form a pennant. The bottom of the card contains a Harvard cheer in red lettering: "Rah! rah! rah! Rah! rah! rah! Harvard!" Good condition as seen in the image. Measures 5 1/5 inches tall and 6 1/2 inches across when folded out.