The Tenpōgoryōban coin was issued in 1837 as part of a debasing recoinage to cover fiscal deficits. The amount of gold contained in one of these (nominally 5-ryō) coins was equivalent to the amount in only four and a half of the 1-ryōTenpōkoban gold coins. The new coin was badly received, and mintage was soon suspended. (see BoJ "History of Japanese Currency")
