The Australian made rims are different in more ways then one in comparison to the early Canadian rims.
The Australian rims are painted black on the inside also the are stitch welded rather than spot welded like the Canadian rim.
The outer pressing are also different.
These early Australian rims have no external markings they are all on the inside.
Later model Australian rims are marked on the outside near the valve.
This seemed to happen sometime in 1977.