The CAM's are usually practically touching at the base. This page from the Lincoln Cent Resource explains that all 1970 cents are WAM. You can't have a CAM because they didn't use any CAM dies that year. Until 1992, both proof and business strike Lincoln cents were made using the same type of reverse die all with a Wide AM. http://www.lincolncentresource.com/wideams.html
It is not really that close. As explained above the close AMs are almost touching, yours has a normal gap. Also with an ageing die the lettering will become thicker and with less definition