Werewolf By Night #1 CGC 9.4 White Pages (9/72) 1ste Jack Russell in own series.
X-Factor #19 - 1987, First battle between X-Factor and Apocalypse's Horsemen
X-Men #104 CGC 9.8 White Pages 1st appearance of Starjammers in cameo.
X-Men #121 1979 First full appearance of Alpha Flight
X-Men #121 CGC 9.8 White Pages (5/79) 1st full appearance of Alpha Flight. Misty Knight & Colleen Wing appearance.
X-Men #133 CGC 9.8 White Pages (5/80) 1ST Wolverine Solo Story
X-Men #137 CGC 9.9 White Pages (9/80) ""Death"" of Phoenix Jean Grey
X-Men #50 CGC 9.8 OW/W Pages 2nd appearance of Polaris. Mesmero appearance. Origin of the Beast. New X-Men logo. Classic Steranko Cover
X-Men #60 1969 First appearance of Sauron (Alter Ego of Karl Lykos)
X-Men #64 1970 First appearance of Sunfire
X-Men #95 1975 Death of Thunderbird; Third appearance of Storm; Third appearance of Nightcrawler; Third appearance of Colossus; Fourth appearance of Wolverine
X-Men #96 1975 1st Appearance of Moira Mactaggert
X-Men #96 CGC 9.8 White Pages (12/75) 1st appearance of Moira MacTaggert.