1928-M 20 Centavos Mule
In numismatics speak a “mule” is any coin minted using front and rear dies intended for two completely different coins. Most mules are the result of unintentional errors in the minting process. For example the Philippine 1918-S 5 centavos mule was the result of a minting error. Not so for the 1928-M 20 centavos mule…