Publisher: Marvel
Cover Date: September 1979
Cover Price: $0.40
Writer: Chris Claremont
Penciller: John Byrne
Cover Artist: Terry Austin
First Appearance: Mutant X (Proteus)
The Uncanny X-Men (1978) #125 Value FAQ
How much is The Uncanny X-Men (1978) #125 worth?
As of October 2026, a near-mint (9.4) raw copy is valued around $35.00; lower grades range from ~$3.50 (Good) to ~$24.50 (Very Fine).
Is The Uncanny X-Men (1978) #125 a key issue?
Yes — it is a key issue, featuring the first appearance of Mutant X (Proteus).
Who created The Uncanny X-Men (1978) #125?
The Uncanny X-Men (1978) #125 was written by Chris Claremont, pencilled by John Byrne, with a cover by Terry Austin.
When was The Uncanny X-Men (1978) #125 published?
Marvel published it with a September 1979 cover date, originally priced at $0.40.
What is a high-grade copy of The Uncanny X-Men (1978) #125 worth?
A Near Mint (9.4) raw copy runs about $35.00. Graded (CGC) copies typically sell for more — available to members.
Price guide
Estimated values by grade, full graded (slab) prices, historical trends, and recent eBay sales for this issue.
The Uncanny X-Men (1978) #125 Value — Quick Raw Price Guide
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