Hi, the type of pin and catch used here looks like the style used by Hauptmuzamt, Wien. If marked, it would be the # 30. Looks like a good badge in black.
Hope this helps. K.
its a good one.
If it is an unmarked 30 its a rather rare one aswell. Nice find!!
It is not marked there. Have to see how closely it compares to a known example. Is there evidence of unmarked 30s? It would be cool to be able to id a maker. My silver is marked 100.