Not all doubling are doubled dies. There is machine doubling which is the same as ejection or mechanical doubling. And there is die deterioration doubling. Doubled dies are usually very pronounced. The good ones anyway. Is 1958 known for having that variety? The Lincoln Cent Resource is usually pretty good on that. OK I see there is a 1958, so compare it to that one and see if it matches. http://www.lincolncentresource.com/doubledies/doubledies.html
No true doubled dies. It does help to explain the situation if you mention which part appears doubled to you, then our replies will help you learn. Jim
