up, up and away, page-27

Stumpytrunks,

The issue seems to be not so simple as you think.

What makes coin not a coin is its usage as exemplified below by the ATO.

"29. To summarise the above, for gold, silver or platinum to be in an investment form for the purposes of the GST Act, it must be in a form that:
is capable of being traded on the international bullion market, that is, it must be a bar, wafer or coin;
bears a mark or characteristic accepted as identifying and guaranteeing its fineness and quality; and
is usually traded at a price that is determined by reference to the spot price of the metal it contains."