70s Captain America Spread on One Artboard

Here’s a unique piece. This is the original scan I have of the art. Below that, I corrected the color a little and cropped it. This looks like it may be an unused 70s Captain America page that Jack had Mike Royer ink. Or maybe this was a commission piece? Or a piece Jack did specifically for a portfolio? I don’t recall seeing Jack doing too many double-spreads on one artboard like this, and there is no Captain America stamp on the top of the art, so I’m not sure of the history behind this one.