Shop for-and learn about-Collectible Mexican Coins. During the centuries that Mexico was a colony of Spain, the silver real was the country's currency. It. Welcome to Coinflation for Mexico. This site measures the current pure metal value or melt values of Mexican coins. Live gold and silver prices are updated. Old coins of Mexico - numismatic catalog with images, descriptions, prices. Monetary system, coinage. Most valuable coins. Pictures of coins.