Wow, never even heard of a Hibernia until today. Yours looks to be in better condition than many of the examples online. Congratulations! What an awesome area you have to hunt!
thanks alot ! I believe it is the farthing, it is smaller than a half penny I believe. Its in my red book, I just dont have it handy at the moment. I dont dig many coins this old, so I'm not all that positive honestly