Judging from the specs you gave, I would have said it was a 1/4 werk. The only one I see on Numista that matches the physical description doesn't have a reverse that matches. This is the closest I could find. https://en.numista.com/catalogue/pieces22979.html
It's certainly possible that Numista just doesn't have it listed. They are a great resource but even they don't have everything in their catalog. You might consider taking it to a coin or jeweler shop so they can test it to see if it is gold.



























