What is it?
The person who discovers something and the person who submits it aren't always the same person. Some coins will even say "Discovered by whoever and submitted by whoever".
That is a improper alloy mix known as a "Woody" Nice find!
The bottom of this page shows another example:
http://www.lincolncentsonline.com/miscellaneous.html
There are some great examples of filled die errors on this page: http://www.lincolncentsonline.com/filleddie.html
Go there and compare with what you have. Hope this helps!
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