What does Cs mean on a Estados Unidos mexicanos coin?

The letter "C" or "Cs" on a Mexican coin stands for "Casa de Moneda," which means "Mint." The Mint of Mexico (Casa de Moneda de México) is a government-owned corporation responsible for producing circulating coins and medals in the country. The Mint of Mexico has several mints located in different cities, including Mexico City, San Luis Potosi, and Guadalajara. The letter "C" or "Cs" is usually found near the date on the coin and indicates which mint produced it.