The X-Men (vol. 1) #1 (Sep. 1963):
by Stan Lee, Jack Kirby, Paul Reinman
12 characters in this story:
This publication is also known as: Uncanny X-Men #1 or X-Men #1.
This is the first issue of the first X-Men series. This is indeed X-Men volume 1, issue #1. Sometimes this is referred to as Uncanny X-Men #1, but the word "Uncanny" was not actually added to the title of this series on the cover until issue #114, and the word was not added to the official name of the publication (as shown in the indicia) until issue #142.
The use of the title "Uncanny X-Men" to retroactively refer to the entire publication since its beginning is often done to distinguish this series from X-Men volume 2, which began in 1991 and has since that time been published concurrently with Uncanny X-Men.
In this database, we are listing issues of this series by the title that appeared on the cover.
Sources vary regarding who was actually the inker on this issue. Instead of Paul Reinman, it may have been Sol Brodsky or Frank Giacoia.