This is not an exact match, but your coin appears to be a one duit from Zeeland (part of the Netherlands) and probably from the earlier half of the 1700s.
View attachment 1868661
I can see the Zeeland coat of arms on one side and, on the other, the large letters ‘DIA’ as part of the 'Zeelandia' inscription normally seen on non-VOC reverses. The one duit in copper would be in the region of 23mm and weigh a little under 4g. If yours is smaller, it will be a fraction of a duit.