I don't see anything special about your coin based on your pics it appears to be a normal circulated coin with some environmental damage. JMO Dave
I see that there may have been a grease filled die on the ST of "STATES" on the back, but, unfortunately, it might be too small to classify as an error. A couple of months ago, I wanted to find out the value of a 1968 D cent I had with a grease filled die (ES missing on STATES, also on the back like yours), so I took it to my local coin dealer, but they were not interested.