Back in the 80s, you needed a pocket full of those $100 coins to buy the smallest item...the stores only wanted to deal in US dollars. I think they were worth a quarter back then, but the cashiers used a calculator to figure out the exchange rate which changed several times in a day.
Sorry to answer your question so late - if you're still interested: See this page > http://worldcoingallery.com/countries/Mexico.php or search for worldcoingallery and click on Mexico. "ASW=" indicates actual silver weight for silver coins - click on the dollar sign for more images and specific info plus NGC price guide. Gold coins were minted in the first half of the 20th century and include 50, 20, 10, 5, 2.5, and 2 pesos denominations. Since 1981, silver and gold bullion Libertads in one ounce and smaller fractional weights have been struck by the Mexican Mint.