Because the only info printed on the lower left margin is "Country of Origin USA" and with NO RKO wording or logo, anywhere, I wondered if this could have been a piece that was produced much later, using the upper artwork from the original insert and it being revamped/reworked to the WC size, omitting the images from the lower half, hence the simpler, blue background, in that lower section.
What is odd, tho, and what caught my eye, is that the lettering of the actor's names, Cooper's name and Schoedsack's name have all been redone (redrawn, if you will), on the mystery piece. Take a look. Even the name Merian, looks to be slightly smaller on the ebay piece. And the spelling of Schoedsack on the ebay version almost appears to have been spelled Schoe
Osack, so someone was a little lax in making the capital letter "D" (as compared to the insert).
Question is: why was all the lettering redone?