This issue is a variant of Astonishing Tales (Marvel, 1970 series) #21 [Regular Edition].
Crespi lettering per Nick Caputo. George Olshevsky's Marvel Comics Index #7B incorrectly credits Gaspar Saladino.
The cover is reprinted as page 10 panel 3 of the story in Astonishing Tales #24.
Revival of Colossus from Tales Of Suspense (Marvel, 1959 series) #14 and #20 (stories reprinted in Monsters On the Prowl (Marvel, 1971 series) #17 and #25). Bob O'Bryan, Diane Cummings and Grant Marshall were introduced in the Colossus story from Tales of Suspense #20 (reprinted in Monsters On the Prowl #25). According to the text article in Astonishing Tales #22 (Kings and Things To Take By Storm by Tony Isabella) Roy Thomas, Marv Wolfman and Don McGregor all helped put this story together.
Job number from the Atlas Tales website.