This issue has variants.
Tuska inks per Nick Caputo. Original indexer credited John Verpoorten. Sources for lettering credits are The Marvel Comics Index (Olshevsky 1981), The Official Marvel Index to the X-Men (Olshevsky 1987), The Official Marvel Index to the X-Men (Ward 1994), and Official Index to the Marvel Universe (Vandal et al. 2009).
The caption in the final panel of the original version says: "You'll find the cataclysmic conclusion of this two-part thriller in Avengers #53! On sale now!" The caption is altered here to read: "You'll find the cataclysmic conclusion of this two-part thriller in Giant-Size X-Men #1". Giant-Size X-Men #1, on sale the month following X-Men #93 (May 1975 cover date)was originally supposed to include a reprint of Avengers #53. Instead Giant-Size X-Men #1 featured a new story which filled the entire book and introduced the new team.
This was the last issue to include reprints. New material began with #94. Avengers #53 was finally reprinted three years later, in 1978, when both X-Men #45 and Avengers #53 were reprinted in Marvel Triple Action #s 45 and 46. Updated information per James Serpas (July 6, 2005) and Tom Hartley (June 8, 2011).
Splash page is signed, "Stan Lee & S. Ditko".