Originally Posted by Wonder Boy
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This X-men sketch by Byrne I would guess is from 1980. With Wolverine in his original uniform, prior to X-MEN 139.



I ran across this one recently, it's included in the book THE ART OF JOHN BYRNE (S Q Productions, 1980). Along with a lot of other nice pages.
https://www.mycomicshop.com/search?TID=598471