The center Berghoff Draft (contents at bottom), is the book can and may be unique.
The Heritage is the book can.
The Coors is fairly tough as a straight steel self-opening can.
Thru the efforts of Coors management and engineers, Coors was ahead of its time and developed their own equipment switching from steel to aluminum for their cans. The savings enabled them to survive the Beer Wars of the sixties and they even sold aluminum slugs to other breweries.
Hi - En Brau Beer "When It Pours, It Reigns!"