Has a ridge ring so DDD die deterioration doubling,still a cent.http://www.error-ref.com/die-deterioration-doubling-incuse/
One thing you will need to learn is the difference between errors and varieties. True hub doubling is a variety. http://www.lincolncentresource.com/FAQ/errors_vs_varieties.html
Hi David - our fellow enthusiasts have captured it well. I'll offer that for the Date and MM, the bigger finds actually have to do with RPMs. But loads going on with this coin to make it a good study piece. Die attrition...plating issues...be sure to check out the links that you were provided. And I wouldn't worry about early posts from any new member just getting into the mix with Variety and Error coins. We all started somewhere.