A rare 20 cent coin from the 1970s is worth up to 400 times ... That’s because of its rarity, with the Royal Australian Mint ...

A collection of rare Australian ... seeking a more recent coin there is this unique one dollar issued in 2000. The Royal Australian Mint accidentally used a 10 cents planchet instead of a $1 ...

Very, very, very rarely there will be some contamination, so a coin will get stuck in the machine in the processing and a 10-cent can end up with the dollars and vice versa. “But it’s exceptionally ...