Any one able to tell me who made this 1/2 oz silver bar?

I was wondering if any of you silver bar guru's could help me id this little gem, looks like it is western Australian with the swan logo and has some age on it but I cannot figure out who minted this. anyone able to help?

 

Not sure.
But I’m sure you have done a hallmark search.
Can be tedious.

 

That swan is the logo for 1979 WA 150th anniversary. M for Mazzucchelli's Jewellers maybe !!!

That M font is consistant to their big M' store front

 

Thanks for the ideas, i have been searching and found nothing, i usually can figure out thingss for myself, this one is eluding and frustrating me

 

Keep slugging away, Serial
You'll get there.
swoydaz