House ad for Showcase [G.I. Joe] #53 (November-December 1964); printed in Batman #168 (December 1964)
Ad designed and lettered by Ira Schnapp
Holy cow, this is a gorgeous cover by Kubert:
Cover of Showcase #53 (November-December 1964), pencils and inks by Joe Kubert, letters by Ira Schnapp
War! What is it good for? Well, great-looking comic books. Other than that, absolutely nothin'.