2500 Tögrög Year of the Monkey

Mongolia's lunar series coins of the early 2000s were produced by the Bern-based Swissmint on contract, a common arrangement for smaller central banks issuing collector gold without domestic refined-metal infrastructure. The 7.776 gram weight is not arbitrary — it corresponds precisely to a quarter troy ounce, the de facto international standard for fractional gold bullion collector issues at that time.