Ad blocker detected: Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker on our website.
The shape of the cartouche containing the Diana head indicates the silver content. In this case the cartouche is the five lobed cinquefoil which represents 800 fineness silver. It also has the tiny number 3 within the cinquefoil which also stands for 800 grade. As a side point, the tiny letter A represents Vienna as the place of assay.
I'm not familiar with the makers mark(4 leaf clover?), but there are several forum members who are experts in this area and may be able to help.