If they are truly cast iron rims, they are either worth a great deal because they are the only cast iron blitz rims know to remain or worth nothing because they should be stamped steel which is considerably less brittle than many forms of cast iron.
Of course, to my eyes the image looks like a garden variety stamped steel rim - albeit in fairly good shape externally (I have no idea if the Australian wheels are subject to the same rot along the line where rim meets disc that we see in eastern Canada).
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