I have just obtained an issue of MARVEL's Rampage Monthly Starring The Hulk: Issue #13 (July 1979) and it has a misprint/error. However, I am not sure if this is a common misprint that all/most prints of this issue had, or if it is a rare/uncommon misprint that would make the comic more valuable.
The misprint/error is:
The front of the comic says the issue number is "No.13" which is correct, but on the inside it says "Volume 1, Number 18" which is obviously wrong. The date on the front (July) and the date on the inside (July 1979) are both correct.
Does any body have any knowledge of how many of this issue were printed with this misprint? Any knowledge is appreciated. Thanks!