date codes for australian made roh rims are on the inner rim so if you have tyres on them you wont see them..easiest way to pic usa rims to oz rims is the stamping next to the valves...BUT..earlier holdens up to 1973 ran usa rims..from later 73 they were roh rims..so all sandmans did not have any stamping next to the valves on the outer rims..