On-sale date from Comic Reader (Street Enterprises, 1973 series) #192, July 1981. There are 4 versions of the facsimile. Three appear to be from a 1991 printing. Two general distribution versions are near identical except for the addition of the text "This is a reprint of the Uncanny X-men #1 Copyright 1991. Reprinted in Canada", at the bottom of the first story page on some issues. The third is a numbered version, limited to 2000 copies, which were signed by Jack Kirby. The fourth 1993 version (herein) has the original indicia removed and replaced by a new indicia at the bottom of the first story page.