I see no mint mark The mm can only be in one place as its stamped on a hardened metal die and doesn't wander arbitrarily around. And i think, but i don't know because you don't elaborate, that you see the lower edge of the bust damaged.
Please create your threads over at the Error Coins forum of CoinTalk.. First worry about if it's actually an error or not. Afterwards ask about value. Most of the time they are minor issues with very little or no premium at all!