First published by Money Metals here: https://www.moneymetals.com/news/2019/07/31/liberty-silver-ounce-origin-001829

The monetization of the “Liberty” silver ounce – the realization of the magnificent, humanistic measure which was proposed by none other than the President of Mexico, Jose Lopez Portillo in 1981 – would bring with it numberless social benefits and historic consequences for Mexico, which we have mentioned in other places.