I agree that this is your coin, though the weight is low. Billon coins vary a lot in silver content, and Numista says this one only has 4% silver, so it will look like copper, even though it may be listed some places as silver.
I didn't find one listed in Zeno, but Goron/Goenka has a drawing matching your coin listed as coin number D166. It also reports a weight of 3.6 g, so I'm not sure why your coin is lower. I would recommend rechecking the weight of your coin.