House ad for Showcase #1 [Fireman Farrell] (March-April 1956); printed in Detective Comics #229 (March 1956)
Comic cover art: pencils and inks by John Prentice
Ad designed and lettered by Ira Schnapp
The first three issues of Showcase faithfully
Until they pretty much threw up their hands and said "the heck with it" by issue #4...