X-Men #120 VF/NM (9.0)
1st appearance of Alpha Flight, X-Men cover and story, Chris Claremont and John Byrne cover and story
X-Men #122 CGC 9.6
1st appearance of Mastermind as Jason Wyngarde, X-Men cover and story by Chris Claremont and John Byrne, Luke Cage, Misty Knight, Colleen Wing and Mariko appear
X-Men #122 NM+ (9.6)
X_men cover and story, 1st appearance of Mastermind, Chris Claremont and John Byrne
X-Men #123 NM- (9.2)
X-Men vs. Arcade cover and story by Chris Claremont and John Byrne
X-Men #123 NM+ (9.6)
X-Men vs. Arcade cover and story, Spider-man appears. Chris Claremont story with John Byrne art!
X-Men #123 NM- (9.2)
X-Men vs. Arcade cover and story by Chris Claremont and John Byrne
X-Men #124 CGC 9.2
X-Men cover and story, white pages, Chris Claremont story and John Byrne art!
X-Men #124 VF/NM (9.0)
X-Men cover and story by Chris Claremont and John Byrne
X-Men #124 VF/NM (9.0)
X-Men cover and story, Chris Claremont story and John Byrne art! likely improvable
X-Men #125 CGC 9.4
X-Men and Phoenix cover and story, Chris Claremont story with John Byrne art!
X-Men #127 VF (8.0)
X-Men cover and story, Chris Claremont and John Byrne
X-Men #127 NM- (9.2)
X-Men cover and story by Chris Claremont and John Byrne
X-Men #127 CGC 9.6
Chris Claremont story with John Byrne art! X-Men vs. Proteus cover and story, white pages
X-Men #127 NM- (9.2)
X-Men cover and story by Chris Claremont and John Byrne
X-Men #128 VF+ (8.5)
X-Men cover and story by Chris Claremont and John Byrne
X-Men #128 (Newsstand) NM- (9.2)
X-Men cover and story by Chris Claremont and John Byrne
X-Men #129 CGC 9.2
1st appearance of Emma Frost, Sebastian Shaw and Kitty Pryde. X-Men cover and story by John Byrne and Chris Claremont.
X-Men #129 (Newsstand) F+ (6.5)
1st Kitty Pryde and Emma Frost, X-Men cover and story, Chris Claremont and John Byrne
X-Men #130 (Newsstand) NM- (9.2)
1st appearance of the Dazzler! X-Men cover and story by Chris Claremont and John Byrne
X-Men #130 (Newsstand) VF/NM (9.0)
1st appearance of the Dazzler! X-Men cover and story by Chris Claremont and John Byrne
X-Men #131 VF/NM (9.0)
1st Emma Frost cover, X-Men vs. the White Queen cover and story by Chris Claremont and John Byrne
X-Men #131 NM (9.4)
1st Emma Frost cover, X-Men vs the Hellfire club, Chris Claremont and John Byrne
X-Men #131 VF+ (8.5)
1st Emma Frost cover, X-Men vs. the White Queen cover and story by Chris Claremont and John Byrne
X-Men #132 NM- (9.2)
X-Men vs. the Hellfire Club cover and story by Chris Claremont and John Byrne