100 Tögrög Chichen Itza

Part of a broad Mongolian commemorative program that licensed UNESCO World Heritage Sites as coin subjects — a revenue-generating arrangement common among smaller central banks in the 2000s. Mongolia had no historical connection to Mesoamerica; the subject was chosen purely for international collector appeal. KM#307.1 distinguishes this from at least one variant in the series, suggesting a design or planchet revision during the run.