Due to the shortage of metal in Japan caused by World War II, this 1945 1 Sen coin was made of baked clay and pressed into service. It circulated in central Japan for only a few days at the end of the war. The coin features Mt. Fuji on the obverse with the value of 1 Sen, while on the reverse is the Imperial Seal of Japan with the name of the issuing authority. The coin comes in two varieties, one in brown baked clay, and the other in red baked clay. Both are quite scarce and mintage is unknown.
Thank you Joel for the image. http://www.joelscoins.com/