Australian bayonet identification

[Saf]

Hi
I wondering if I could get help to identify the Australian bayonet (in the picture) , it has been in the family for years. I believe it could be WW2 era but not sure but used by a Australian soldier. And hence what type of gun it would've been attach to (Owen Gun?).
Any help or any website you could send me to help me identify it would be grateful.

Thanks

SAF
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