This is a poster that had two known print runs at least. As I described one of them:
"Note that there are two different variations of this poster. One of them has the "3-D" at top left colored in yellow, and also all of the letters of the title. The other is exactly the same as that poster, but the yellow is missing from the letters (and perhaps from the entire poster). Otherwise, the posters are exactly the same, including the NSS information at bottom. My personal belief is that there were two different print runs of this poster, and that one print run did not use the yellow, for unknown reasons (perhaps the answer could be as simple as them running out of yellow ink!)."
So this could be yet a third variation. Of course, in the case of restored posters, the more likely answer is restoration in that area. This could best be resolved if someone produced a "before" image of the poster, but the chances of that are slim to none.
Bruce