- Marvel Comics
- Chris Claremont story
- John Byrne & Terry Austin art
- Dave Cockrum & Terry Austin cover
- 318 copies in 9.8 on CGC census, 455 in 9.6, 375 in 9.4
- 1st appearance of Mutant X (Proteus)., Mastermind appearance., Magneto cameo
X-Men 125: CGC 9.4 – 1st Appearance Mutant X
$290.00
- X-Men 125
- September 1979
- CGC grade 9.4
- White pages
- 1st appearance of Mutant X (Proteus)
- Certification #3898739004
- Case may have minor scratches
Out of stock
SKU: 3898739004
Categories: Comic Books, Graded Comics, X-Men Universe
Tags: 1st Appearance, CGC, Chris Claremont, John Byrne, X-Men
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