The 1859–1868 Japan 1 Bu Gin (Ansei era) is a rectangular, silver ".873 fineness" coin, often called "samurai money," minted during the final years of the Tokugawa Shogunate. Meiji Restoration. They feature a distinct rectangular shape, weigh approximately 8.62g–8.7g, and have a mintage of roughly 11.4 million.