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The Melbourne Mint only used reverse B which has B.P. this is the case here and the exergue line is close to the border, as it should be so looks like reverse B to me.
Not so sure about the mint mark.
Not a very rare date, so don't take any chances.
@tallthinkev said "Some coins, whether silver. gold or base are quite nice and could make a nice personal collection, however I don't think they will be major money makers. "
Yes, like my little sixpence collection. They are never going to be worth much. But to keep collecting interesting, I think it's good to have a hobby with it too, apart from investment coins.