Uncanny X-Men #221 (Newsstand edition) VF/NM (9.0)
1st appearance of Mister Sinister! Havok vs. Wolverine cover and story! Chris Claremont story and Mark Silvestri cover and art
X-Men #244 VF/NM (9.0)
1st appearance of Jubilee, X-Men cover and story, Mark Silvestri art, Chris Claremont story
X-Men #266 CGC 9.6
1st appearance of Gambit! X-Men and Storm cover and story
X-Men #266 CGC 9.6
1st appearance of Gambit! X-Men and Storm cover and story, Chris Claremont story
Uncanny X-Men #317 NM (9.4)
1st appearance of Blink, art by Joe Madueira, X-Men cover and story, might make 9.6