The coin was struck on a cent with an improper alloy mix ("woody"). Looks like the mintmark took a hit, I don't think it's an RPM.
These are nicknamed "woodies" due to the wood grained look. The proper term is "improper alloy mixture". Here is a reference link: http://error-ref.com/improper-alloy-mix.html You beat me by 1 min non cents. Lol!