Vintage Uniforms from the State Library of Victoria collection
Victorian Artillery Regiment
Although the SLV labels this as c.1900, enlarging the button shows it to displat the field gun surmounted by the QV crown i.e. 1876-1891 as per Cossum.
Australian Military Forces: private W. Norman c.1915
Victorian Police Force
http://www.austbuttonhistory.com/uniform-buttons-2/uniform-buttons/#Victorian_Police_Force
Commonwealth Clothing Factory