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X-Men #11 Marvel Comics 1992 (VF/NM) Iconic Jim Lee Wolverine Cover
X-Men #113 Marvel 1978 (VF/NM) John Byrne Cover
X-Men #12 Marvel 1965 (VG-) Origin & 1st App. of the Juggernaut
X-Men #120 Marvel 1979 (FN/VF) 1st Cameo App of Alpha Flight!
X-Men #13 FN+ (1965) 2nd app. of Juggernaut!
X-Men #13 Marvel 1965 (F/GD) Several Flaws - See Description
X-Men #13 VG/FN (1965) 2nd app. of Juggernaut!
X-Men #136 VF/NM (1980) John Byrne Dark Phoenix Saga!
X-Men #138 Marvel 1980 (VF/NM) Cyclops Leaves the X-Men! NEWSSTAND!
X-Men #139 Marvel 1980 (VF) Kitty Pryde Joins X-Men! NEWSSTAND!
X-Men #14 Marvel 1965 (FN-) 1st Appearance of the Sentinels!
X-Men #14 Marvel 1965 (GD-) 1st Sentinels! Bottom Staple Detached
X-Men #14 VG- 1st appearance of the Sentinels!
X-Men #140 Marvel 1980 (VF+) Alpha Flight Disbands
X-Men #141 Marvel 1980 (NM-) Days of Future Past Part 1
X-Men #142 Marvel 1981 (NM-) Days of Future Past Part 2
X-Men #144 Marvel 1981 (NM-) Cyclops Solo Story! NEWSSTAND
X-Men #15 Marvel 1965 (F/GD) 1st Master Mold - Bottom Staple Detached
X-Men #16 FN (1966) 3rd app. of Sentinels!
X-Men #16 Marvel 1966 (FN-) 3rd App. of the Sentinels
X-Men #16 Marvel 1966 (VG+) 3rd App. of the Sentinels!
X-Men #18 Marvel 1966 (VG+) Magneto Cover!
X-Men #19 Marvel 1966 (VG+) 1st App. of the Mimic
X-Men #20 Marvel 1966 (FN/VF) Professor X Origin - Jack Kirby Cover
X-Men #20 Marvel 1966 (VG+) Origin of Professor X
X-Men #205 Marvel 2005 (VF/NM) 1st App of Hope Summers - NEWSSTAND
X-Men #21 FN- (1966) Jack Kirby Early X-men issue!
X-Men #21 Marvel 1966 (FN/VF) Lucifer Appearance!
X-Men #21 Marvel 1966 (GD) Lucifer Appearance - Cover Detached
