This is technically a first printing that inadvertently duplicates 4 sheets or 16 pages of the book. (The exact pages will vary due to the nature of the printing process. Each "page" when printed is 1/4 of a printed sheet--as this issue has 48 pages, page numbers 1, 2, 47 and 48 are on the same sheet.)
Marvel requested that all stores return "damaged" copies which were quickly replaced but many copies were kept by collectors. A perusal of the first 10 pages or so should give an idea of whether the copy they have contains the printing error as most copies seem to have only been affected with either the first 4 sheets or the second 4 sheets being duplicated.