Now that Leland's has the knowledge gained from the "before" pictures supplied by John, I think it would be safe to remove this line from the description....
"There is some chipping at the upper edges, and some residue on the reverse, meaning the poster may have been mounted at one time."
Also, not to pile on, and maybe it's just semantics,
but I also would also disagree with their assessment that "the restoration work is virtually undetectable" when it's clearly visible when looking at the photo...