I'm sorry, I didn't describe that well. The coin is almost exactly the same size of a nickle and I have put it in a fob that has a hole the size of a nickle. It's very very slightly larger than a nickle, so I will probably never get it out.

And now that I think about it, I'm not so sure that it is a British coin... but it does have the Queen on it. Maybe I will have someone look at what's on it the next time I go into town.