First use of the iconic block-lettered X-Men logo as created by Jim Steranko.
Possible Steranko color credit by Nick Caputo. Steranko colors credit is corroborated by The Marvel Comics Index (Olshevsky 1981) and The Official Marvel Index to the X-Men (Olshevsky 1987).
The Origins of the Uncanny X-Men! part 13, origin of the Beast part 2, page 1 of this story is not reprinted in the Amazing Adventures #17 and X-Men: Mutations #nn reprints.