House ad for the "3 Girls" series premiering in Heart Throbs #102 (June-July 1966); printed in Secret Hearts #112 (June 1966)
Ad art by Jim Pike; ad designed and lettered by Ira Schnapp
Cover of Heart Throbs #102 (June-July 1966), pencils by Jay Scott Pike, letters by Ira Schnapp
"3 Girls" was a rare experiment to introduce a running serial story to one of DC's romance comics. It lasted 22 episodes, through Heart Throbs #123, just making it into the seventies. There is no truth to the rumor that Sandy, Chris, and Marian have formed a bounty hunter organization and are now hunting super-criminals in the New 52.
Also, Sandy Simms is no relations to Chris Sims, dagnabbit.