Comment: Hi Greg.

The coins you mention, except for the Krugerrand, have a face value in dollars stamped on them. The government purposely did that to discourage there use. Because the stamped amount is not the actual value.
Liberty dollar is trying to win a court case, where they used coins with dollar amounts stamped on them, and the treasury department raised a stink.

Whereas, bars have no stamped value and would be worth close to the world spot value in any kind of Gold for product or services exchange.

I'm just using the Gold above as an example, but Silver bars are made also and could be used for smaller amounts.

Credit Swiss bars are known and respected all over the world as international money, but not at our local supermarkets or gas stations.