House ad for Aquaman v.1 #45 (May-June 1969); printed in Wonder Woman #182 (May-June 1969)
Comic cover art: pencils and inks by Nick Cardy
Ad designed and lettered by Gaspar Saladino
Why? Well, because this:
Panels from Aquaman v.1 #45 (May-June 1969); script by Steve Skeates; pencils, inks, and letters by Jim Aparo
Also, because of this!