Silver Age (1956 to 1970)

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X-Men #60 VG- (1969) 1st app. of Sauron!

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X-Men #56 GD+/VG (1969) 1st appearance of the Living Monolith!

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X-Men #40 FN/VF (1967) 1st app. of Grotesk! Origin Cyclops!

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X-Men #37 VG- (1967) 1st app. of the Mutant Master!

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X-Men #34 VG- (1967) Mole Man & Tyrannus appearance!

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X-Men #8 (1964) 1st app. of Unus the Untouchable!RESTORED