1984 1 Onza World Wide Mint Viva Mexico Cap and Rays Vintage Silver Proof Round. Commemorative round contains 1 ounce of. Obverse: Features a Phrygian cap with radiating rays and the word. Design is inspired by the historic Mexican 8 Reales coins. Reverse: Features the words Viva. Mexico and the date accompanied by the World Wide Mint hallmark. The encircling inscriptions read “Una Onza Troy” and. 999 fine Silver Proof. Commemoratives celebrate Mexican coinage. They were made by the World Wide Mint, known for producing the highly rare and collectible Coca Cola Silver art bars and rounds. ? Check out and follow the store for other auctions and listings.