One thousand nine hundred Tenpo Koban coins from the construction site of the Nisshin Oil Refinery Building
On August 24, 1963, the Nisshin Oil Building in Shinkawa, Chuo-ku, Tokyo, was renovated. On August 24, 1963, 1,900 Tenpo koban (small seal) and 55,925 pieces of red gold were found at the renovation site of the Nisshin Oil Building in Shinkawa, Chuo-ku, Tokyo. On August 24, 1963, 1,900 Tenpo koban and 55,959 pieces of 2-shu gold were found at the renovation site of the Nisshin Oil Refinery Building in Shinkawa, Chuo-ku, Tokyo, creating an untimely "gold rush. Photo taken on August 24, 1963. 100 Million People's History of the Showa Era" (7), p. 157
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