About uncirculated 1959 Gold 20 PESO. Contains .4823 oz of Gold. Obverse: Mexican coat of arms featuring a Golden eagle perched atop a cactus, devouring a snake. Date below wing. Reverse: Aztec Calendar Stone above legend bearing denomination and metal content. Issued by Banco de México from 1917-1921 and again in 1959. From 1960 to 1971 Gold 20 Pesos were minted with the restrike year of 1959.