The term 'Mexican Coin' can be broken down into two crossword solutions: PESO (4 letters) and Tlaco (5 letters). The PESO is the official currency of Mexico and has been in circulation since the early 19th century. It is divided into 100 centavos and is denoted by the symbol '$'. The Tlaco is a silver coin that was used in Mexico during the colonial period. It was minted from 1732 to 1821 and was worth 8 reales.