I believe that the rifle shown in the GB ad was made by High Standard for JC Higgins and only sold by Sears. Go to Borders or Barnes and Noble and look at one of the big books of exploded drawings that they have in their "Sports" sections (Can't remember the titles, but you can't miss 'em--thick softcover books). Look under both J.C Higgins and High Standard .22s; you'll find it. They were quite popular and well made. Not sure if they stopped making them by 1958; probably not.