Well, perhaps vaguely, but in contradistinction to that Celtic stater, your piece is a different diameter, different mass, different relief, different metal, and uniface rather than having a design on both sides. I'm sorry that I can't be more helpful, but I don't think that we have a match just yet.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz