Ziff-Davis
Ziff-Davis's G.I. Joe was set during the Korean War. Ziff-Davis was in the habit of numbering their first issues "10". When the series became popular, they reset the numbering system, so there are two issues for each number from 10 to 14, and no issues numbered 1 through 5.
Volume 1 started in 1950 and lasted five issues, numbered 10 through 14. Volume 2 continuing from the previous volume was published from 1951, and lasted 46 issues numbered 6 through 51.
Read more about this topic: G.I. Joe (comics)