Silver Age (1956 to 1970)

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Amazing Spider-Man #34 Marvel 1966 (GD-) 2nd App. Gwen Stacy

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Amazing Spider-Man #30 Marvel 1965 (F/GD) 1st App. Cat Burglar

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Amazing Spider-Man #28 Marvel 1965 (GD-) 1st App. Molten Man

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Amazing Spider-Man #26 1965 (GD/GD+) 1st Crime Master Centerfold Loose

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Amazing Spider-Man #17 Marvel 1964 (GD+) 2nd App. Green Goblin

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X-Men #63 Marvel 1969 (VG/FN) 1st App. of Lorelei - Neal Adams

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X-Men #62 Marvel 1969 (FN-) 1st Savage Land - Bottom Centerfold Detached

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X-Men #61 Marvel 1969 (VG/FN) 2nd Appearance of Sauron - Neal Adams

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X-Men #60 Marvel 1969 (FN/VF) 1st Appearance of Sauron - Neal Adams

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X-Men #56 Marvel 1969 (FN-) 1st App. of the Living Monolith - Neal Adams

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X-Men #55 Marvel 1969 (FN+) 2nd App. of Alex Summers (Havok)

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X-Men #54 Marvel 1969 (VG) 1st App. of Alex Summers (Havok)

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X-Men #53 Marvel 1969 (VG+) 1st Barry Windsor-Smith Art

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X-Men #52 Marvel 1969 (FN+) 1st Full App. of Erik the Red

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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