X-Men #221 (Newsstand edition) CGC 9.6
1st appearance of Mr. Sinister, Havok vs. Wolverine cover, X-Men vs Marauders story
X-Men #266 CGC 9.6
1st appearance of Gambit! X-Men and Storm cover and story, Chris Claremont story
Avengers #257 CGC 9.6
1st appearance of Nebula, who appears in both the Infinity Gauntlet, and the Marvel movies, Guardians of the Galaxy, and Avengers Infinity War and Avengers Endgame, Avengers cover and story
Daredevil #56 VF+ (8.5)
1st appearance of Death's Head, Daredevil cover and story
Daredevil #22 VF (8.0)
1st appearance of the Tri-Man, Daredevil cover and story, Daredevil vs the Owl, the Gladiator, and the Masked Marauder, Stan Lee and John Romita
Captain Atom #84 F+ (6.5)
1st New Captain Atom, 2nd Blue Beetle, Steve Ditko art
Captain Atom #84 VF (8.0)
1st New Captain Atom, 2nd Blue Beetle, Steve Ditko art
X-Men #120 VF+ (8.5)
1st appearance of Alpha Flight, X-Men cover and story by Chris Claremont and John Byrne
X-Men #64 F/VF (7.0)
1st appearance of Sunfire, X-Men cover and story, Neal Adams cover art
X-Men #58 F+ (6.5)
1st Havok! Neal Adams cover and art! X-Men cover and story by Roy Thomas and Neal Adams
X-Men #44 F+ (6.5)
1st Silver Age appearance of Red Raven, X-Men cover and story
X-Men #111 VF/NM (9.0)
1st appearance of Arcade! X-Men cover and story by Chris Claremont and John Byrne
X-Men #122 NM+ (9.6)
X_men cover and story, 1st appearance of Mastermind, Chris Claremont and John Byrne
X-Men #130 VF+ (8.5)
1st appearance of Dazzler, X-Men & Dazzler cover and story by Chris Claremont and John Byrne art!
X-Men #134 VF/NM (9.0)
1st Dark Phoenix, X-Men cover and story, Chris Claremont and John Byrne
Uncanny X-Men #212 (Newsstand edition) VF+ (8.5)
1st Wolverine vs Sabretooth battle, X-Men vs Marauders story
Werewolf by Night #10 VF (8.0)
1st appearance of the Committee, Werewolf by night cover and story, likely improvable
Sub-Mariner #32 F (6.0)
1st appearance of Llyra! Sub-Mariner cover and story
Strange Tales #178 F+ (6.5)
1st Warlock by Jim Starlin! 1st Magus! Warlock cover and story
Special Marvel Edition #16 VF- (7.5)
1st appearance of Midnight, 2nd appearance of Shang Chi, Master of Kung Fu, Jim Starlin art
Conan the Barbarian #14 VF/NM (9.0)
1st appearance of Elric, Conan cover and story with art by Barry Smith! , nice picture frame issue
Tales to Astonish #54 VF+ (8.5)
1st appearance of El Toro, Ant-Man (Giant Man) and Wasp cover and story, Stan Lee and Jack Kirby