Original 1929 Ford Tri-Motor Airplane Ad Proof. This Ad Proof would have been sent to Ford by the Magazines or Papers that ran this Ad, these include Literary Digest, Time, Business Week, Forbes, Scientific American, Railway Age, Nation's Business, World's Work and Review Of Reviews. This Ad highlights the many practical uses of the Ford Tri-Motor Plane. It is in good condition with minor wear and blemishing [see photos]. It is printed on slick paper and is creased in middle from being folded in half [crease has minor tearing]. Very rare piece that will make a cool framed display item.