‘Mule’ is a term used for the offspring of a donkey and a horse.
Similarly, in the coin industry a ‘mule’ is the by-product of two seemingly incompatible dies being used on the same planchet to create an entirely unique hybrid.
A mule such as this which exhibits two different counties’ currency is incredibly scarce and represents the pinnacle of error collecting.
1978 Australian mule 20c struck with a Fijian 20c reverse
Grade: Choice Uncirculated
Extremely Rare with only 2 examples known to exist