While the Japan Mint has issued 50,000 proof sets commemorating the 20th Anniversary of the Enthronement of Emperor Akihito, a maximum of only 5,000 sets have been reserved for the overseas markets.
Each proof sets includes a 10,000 Yen gold coin (20 gm., .999 fine, 28mm.) and a 500 Yen nickel-brass coin (7 gm., 26.5mm.) in a presentation box, with a certificate of authenticity. The reverse of each coin features the chrysanthemum Imperial Crest of Japan. A mythological Phoenix—symbol of the Emperor--is featured on the gold coin, rising above the main gate (Nijyu-bashi) bridge at the Imperial Palace. The obverse of the nickel-brass coin pictures a chrysanthemum flower. Chrysanthemums were first cultivated in China as a flowering herb as far back as the 15th century BC, and were introduced into Japan probably in the 8th century AD, when the Emperor adopted the flower as his official seal.