I Can Only Think Australian With The Boomerang?

:blush:

I have no idea on this one sorry, any help
Thanks
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I canā€™t give you any information on this except to say that the use of ā€œSTG SILā€ or ā€œSTG SILVERā€ is typical of Australian silver - and the boomerang pretty much puts it out of all doubt.