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Uncanny X-Men #221. 1st App. of Mister Sinister. CGC 9.4

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CGC graded 9.4 Uncanny X-Men #221.

Published by Marvel Comics in September of 1987.

WHITE pages.

1st appearance of Mister Sinister (Nathaniel Essex).

Marauders appearance.

Chris Claremont story.

Marc Silvestri & Dan Green cover & art.