Mexican Silver Marks
Mexico's jewelry hallmarking system has undergone several changes over the course of history.
In 1946, an Eagle Hallmarking System was implemented. It was used through 1979, when it was ultimately abandoned due to its inefficiency.
In 1979, the Eagle system was replaced with a letter/number hallmarking system, which is still used to this day.
Below is a guideline used to date Mexican jewelry pieces.