We are all different and value different things in life. I have utmost respect for all. Having said that, I would kill to have had anything from my legend of a grandfather.
Personally, I would keep it as a pocket piece... but I'm weird like that. If you don't want it, I'd give you $2.00 for it, with a fresh $2 dollar bill.
I understand about downsizing, minimalism, I don't like clutter. But I can't imagine 1 coin taking up that much space.
Even if you don't want it I wouldn't throw it away. There are some people that collect counterfeits and they would like to have it.