I'm afraid I'm going to disappoint you. They are not Australian, and not silver.
That is the mark of the German company, WMF (WÃ¼rttembergische Metallwarenfabrik). If you search the forum you'll find a lot of their work. The I/0 mark indicates their regular silver plating. http://www.925-1000.com/silverplate_W3.html Trev.