1 yen coin in Japan has the following details:Obverse: Features a young tree called a \"Wakagi\" in the middle, surrounded by Kanji text that translates to \"Year 3 of Meiji Great Japan 1 Yen\". The tree symbolizes Japan's healthy growth.Reverse: Features a radiant sun surrounded by a wreath, with the chrysanthemum emblem flanked by two Japanese government seals. The chrysanthemum is a symbol of the Japanese Imperial Family. The reverse side also displays the year of minting, which is expressed by the year in the emperor's reign. For example, 2024 is Reiwa 6.Material: Made of aluminum, the 1 yen coin is the lightest Japanese coin.Size: Has a diameter of 20 mm and weighs 1 gram.History: First issued in 1955, the 1 yen coin is the oldest coin currently being manufactured in Japan. The design has remained unchanged for over 50 years.