Whether it's PMD or not, I'd put it up on ebay. Don't say it's an error, don't say it's PMD, just list it for what it is, a penny with an interesting date, and let the bids go where they may.
Come on guys! This is a 1981 that the 1 took a hit! Let's not over think this. It was probably on the end of a roll at one time and the part of the machine that crimps the roll hit the one. Please don't listen to people that say put it on eBay! That's not what collecting is about. Spend it already!