Published November, 1965 (Silver Age) by Marvel Comics and went on sale in 1965 for $0.12 USD. This issue contains 32 pages in Color, the current NM value is $800.00 USD.
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This is the first appearance of The Sentinels. I think it's another stellar Lee/Kirby issue for the X-Men. Really good storytelling and artwork. Also, after this issue is when this title goes monthly. (at least for awhile...)