Normal beat up circulated cent, no reason to send to PCGS. Copper coins can be a wide range of colors depending on what has happened to them over the years.
Who told you it was rare? Did you read about it in "Strike It Rich With Pocket Change"? If so, throw the book away. Chris
Over a half billion were minted so why is it rare? It's environmental damaged. Sending in it to grade it is a waste. It's only worth a cent and I'd spend it.
I read that this Lincoln Cent is rare. Because the secret service was confiscating them because back then the mint thought they were counterfeit but later admitted that they were not.
Only the very rare 1969-S Doubled Die Cents are rare. As stated above, over 500 Million of them were minted as normal coins - which your coin is. You can spend it. Just because a car has four wheels doesn't mean it's a Rolls-Royce.
http://news.coinupdate.com/doubled-die-lincoln-cent-1810/ mentions the secret service thing but this one is what I and others are talking about as the mentioned cent., yours is not, http://www.lincolncentresource.com/doubledies/1969Sddo1.html Jim
I'm not a true Lincoln Cent collector but I do have some. As for a 1968-S, I have a brand new BU roll tucked away somewhere so they are common.