got recently a lot of coins and among them, found this coin on the left:


which I identify as: https://en.numista.com/catalogue/pieces23093.html year 1800 or 1803? The point is the diameter is smaller than 22.6 mm, it is about 18-19 mm, I put a 1 Centime for size comparison. I don't have a scale to weigh it, sorry, but it clearly seems billon. Do you think it was cut in this smaller size, or maybe was struck on a smaller planchet? Or maybe a fake?