Indicia title is The Mighty Thor. The advertising insert adds four pages to the magazine.
This issue is a variant of Thor (Marvel, 1966 series) #410.
There exist further variants:
Letters from: James Wolford, Aaron "Mr. Hate" Sims, Paul Coate; Martin Musick, Brian Fox, Ed Masters, Tryke Kemnitz, Nadeem Younas, James and Jeff Rey, and Tim Askin. Includes a small illustration of the next issue's cover.