Hallmarking metals

Hi folks, I need some advice please. I am making some pieces using sterling silver and aluminium. I have not been stamping them as sterling as I thought it wasn’t best practise due to the lower grade, non precious metal component, but I’m wondering if this assumption is wrong, and I can stamp as if it is sterling? Oh, I should have said I’m in Australia - apparently different rules apply in different countries.

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An older post that may be helpful

And, here is another definitive source Assaying - Hallmarking - Research Guides at State Library of Victoria