Very rarely there are printing issues on coins. Which means it could either be a mistake, and there was a batch like that, or maybe someone did that. But, judging by the year, it might be an oddity. You might have a one of a kind coin. I would keep it. Because someday, pennies may no longer be used, and when that happens, coin collectors are going to go crazy. Yours might already be worth something. Even if they don't discontinue pennies, later, it will be worth more. But if you want, post it on classifieds, or go on craigslist (a site to sell things locally.) That's how you get attention on these kind of things.