Uncanny X-Men #4, 1964.
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Very Fine Copy!
1st team appearance of the Brotherhood of Evil Mutants led by Magneto
1st appearance of Scarlet Witch
1st appearance of Quicksilver
1st appearance Mastermind, later becomes
Jason Wyngarde
1st appearance of Toad
2nd appearance of Magneto
Scarlet Witch's costume is colored green on the cover, it is red in the story