It's not a lamination error. This site explains what it is: http://www.lincolncentsonline.com/miscellaneous.html
That site also has a three section error guide that explains a lot about what errors are and how they happen. Hope this helps!
Cents with no mint marks are minted at the Philadelphia mint. The coin you are describing sounds like it may be a "dryer coin". There is an example of one on this page: http://www.lincolncentsonline.com/pmd.html