Silver Age (1956 to 1970)

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X-Men #51 Marvel 1968 (FN-) 1st App. of Erik the Red - Steranko Cover

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X-Men #49 Marvel 1968 (FN-) 1st App. of Polaris - Steranko Cover

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X-Men #48 Marvel 1968 (VG+) Marvel Girl Appearance

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X-Men #47 Marvel 1968 (FN-) Beast & Iceman Appearance

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X-Men #46 Marvel 1968 (FN-) Classic Juggernaut Cover

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X-Men #45 Marvel 1968 (FN+) Cyclops Appearance

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X-Men #42 Marvel 1968 (FN-) Death of Professor X

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X-Men #41 Marvel 1968 (VG-) 1st Appearance of Grotesk

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X-Men #40 Marvel 1968 (VG-) Classic Frankenstein Cover

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X-Men #39 Marvel 1967 (FN) Cyclops Origin - New Costumes

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X-Men #37 Marvel 1967 (VG-) 1st App. of Mutant Master

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X-Men #36 Marvel 1967 (VG/FN) 1st App. of Mekano

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X-Men #35 Marvel 1967 (VG-) 1st App. Changeling - Spider-Man App.

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X-Men #34 Marvel 1967 (FN-) Tyrannus & Mole Man Appearance

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X-Men #33 Marvel 1967 (VG) 4th App of Juggernaut

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X-Men #32 Marvel 1967 (VG+) 3rd App of Juggernaut

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X-Men #31 Marvel 1967 (GD+) 1st App. of Cobalt Man

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X-Men #30 Marvel 1967 (VG+) Warlock Appearance

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X-Men #27 Marvel 1966 (VG-) Mimic Joins Team

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X-Men #26 Marvel 1966 (FN-) El Tigre Appearance

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X-Men #26 Marvel 1966 (FN) El Tigre Appearance

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X-Men #25 Marvel 1966 (VG-) 1st App. of El Tigre

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X-Men #24 Marvel 1966 (GD+) 1st App. of Locust

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X-Men #23 Marvel 1966 (GD-) Count Nefaria Appearance

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X-Men #22 Marvel 1966 (GD-) Count Nefaria Appearance

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X-Men #21 Marvel 1966 (GD) Lucifer Appearance - Cover Detached

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X-Men #21 Marvel 1966 (VG-) Lucifer Appearance

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X-Men #20 Marvel 1966 (VG+) Origin of Professor X