The former coin of Japan is the SEN, which was a silver coin used in Japan from the 17th century until the Meiji period. It was first minted in 1636 and was used as a form of currency until 1871, when it was replaced by the yen. The SEN was made of silver and had a value of one-hundredth of a yen. It was widely used throughout Japan during the Edo period and was an important part of the Japanese economy.