Astor Base Metals:
This buckle is marked Astor Base Industries underneath.
Quoting from the Astor Industries web-page:
“Astor Industries is an Australian manufacturer of premier plastic injection moulded, electroplated, decorated and assembled components. Built on a foundation of Quality and Service, Astor Industries’ is recognised by its long-term customers as leaders in quality injection moulded items, including decorative ornaments, automotive spare parts and most notably, Astor Industries’ signature product, the automotive badge … The core team at Astor Industries has extensive history and expertise in manufacturing and decoration of both plastic and base metal products … Many of Astor Industries’ customers and suppliers are familiar with its historical operations under Astor Base Metals, who served the Australian manufacturing sector for over 50 years, preceding its sale on April 2, 2015.”
Presumably Astor Buttons (Aust) Pty. Ltd. (registered in 1983) is a subsidiary of Astor Industries, previously Astor Base Metals Pty. Ltd. (founded in 1957). See also the Astor page.