Mint Assayers in Colonial Times
Places of Coinage, Essayers, Masters of the Mint and Judges of Balance
Assayers in Spanish America
Each coin identifies the place of coinage and also the person responsible for the law of the coin (purity and weight) called the assayer. Usually the initials of the names were used and could be one or two assayers by minting. In the case of Philippines well into the nineteenth century also included the person responsible for balance. This is an example of how to identify these signs in coins.
Potosi: PS Assayer L Leandro Ozio Value: 8 ( Reales):