The coins came from a collection in China.
Originally they were thought to have been made from gold and silver but the collection was in a poor state, and the coins were damaged when they were put in the box they were found in.
They were found to be marbled and engraved with Chinese characters.
“The marbled elements were found with very little damage to the surface of the coins, and so it’s very unlikely that they were made from silver or gold,” Mr Wilson said.
Mr Wilson said the coins would not have been valuable in the way they were if they had not been marbled.
He said the marbled appearance could have been achieved by adding paint and the addition of other marbles.
The coins would have been worth around $US5,000 when they arrived.
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