X-Men #143 NM (9.4)
X-Men cover and story by John Byrne and Chris Claremont, Kitty Pryde joins
X-Men #158 NM- (9.2)
2nd appearance of Rogue, X-Men vs. Rogue cover and story
X-Men #183 (Newsstand) CGC 9.8
Highest CertifiedX-Men cover and story by Chris Claremont and JRJR , Juggernaut vs. Colossus
Uncanny X-Men #201 CGC 9.8
Highest Certified1st appearance of Nathan Summers (as a baby) who later becomes Cable! X-Men cover and story
X-Men #201 CGC 9.8
Highest Certified1st appearance of Nathan Summers (as a baby) who later becomes Cable!
X-Men #205 VF/NM (9.0)
Origin of Wolverine and Lady Deathstrike, Barry Windsor Smith cover and art
X-Men #205 NM- (9.2)
X-Men cover and story, Origin of Wolverine and Lady Deathstrike, Barry Windsor Smith cover and art
X-Men #212 NM- (9.2)
Classic Wolverine cover by Barry Smith, 1st Wolverine vs. Sabretooth story, X-Men vs Marauders story
Uncanny X-Men #213 CGC 9.6
Classic Wolverine vs Sabretooth cover by Alan Davis, X-Men vs Marauders story, Psylocke joins the team
X-Men #213 VF/NM (9.0)
Classic Wolverine vs Sabretooth cover by Alan Davis, X-Men vs Marauders story, Psylocke joins the team
X-Men #213 NM- (9.2)
Wolverine vs. Sabretooth cover by Alan Davis, 1st Wolverine vs. Sabretooth story, X-Men vs Marauders story
X-Men #221 CGC 9.8
1st appearance of Mr. Sinister, Havok vs. Wolverine cover, X-Men vs Marauders story
X-Men #221 (Newsstand edition) CGC 9.6
1st appearance of Mr. Sinister, Havok vs. Wolverine cover, X-Men vs Marauders story
X-Men #221 CGC 9.6
1st appearance of Mr. Sinister, Havok vs. Wolverine cover, X-Men vs Marauders story
X-Men #221 CGC 9.4
1st appearance of Mister Sinister! X-Men and Wolverine cover and story, Chris Claremont and Marc Silvestri
X-Men #221 NM+ (9.6)
1st appearance of Mister Sinister! X-Men and Wolverine cover and story, Chris Claremont and Marc Silvestri
X-Men #221 CGC 9.8
1st appearance of Mr. Sinister, Havok vs. Wolverine cover, X-Men vs Marauders story
X-Men #244 CGC 9.4
1st appearance of Jubilee! Chris Claremont and Marc Silvestri
X-Men #244 CGC 9.6
1st appearance of Jubilee! Chris Claremont and Marc Silvestri
X-Men #244 CGC 9.8
1st appearance of Jubilee! X-Men cover and story by Chris Claremont and Marc Silvestri
X-Men #256 VF (8.0)
1st appearance of the New Ninja Psylocke! X-Men vs the Mandarin cover and story, Jim Lee art