Mmmm: premade frozen tuna pie.

Pre-Charlie. Star-Kist was still using the fisherman with a giant ring in his ear, I presume. Charlie didn’t come along until the late 50s.

Or maybe it’s not Pre-Charlie. Star-Kist’s page says:

"1958. Star Kist hires Leo Burnett to develop a new campaign to "establish a quality image for StarKist tuna and distinguish it from its main competitor."

Burnett's approach focuses on the fundamental ideas that research has discovered:

Consumers want tuna that tastes good and they do not like tuna that tastes "fishy."

That might explain the tagline at the bottom: America’s Best in Flavor Tests.”