It is the second-highest denomination coin in Japan, after the 500 yen coin. The current 100 yen coin is one of two denominations that depict the emperor's rule date in Arabic numerals rather than kanji . 100 yen coinage was first authorized in 1951 with the specification that the coins be made of a silver alloy.
Are these 100 South Korean won coins still in circulation?
They are part of the South Korean Won coins series. The Bank of Korea started issuing these 100 South Korean Won coins in 1983. They are currently still in circulation. Admiral Yi Sun-sin is depicted on this 100 won coin from South Korea.
Why did a 100 yen coin become a substitute?
The "100 yen" bill hence became a substitute to the coin as the two were allowed to co-circulate. The design of the coin was later changed in 1959 which removed Latin script ("Yen") and changed the reverse side to show a sheaf of rice.
