Wanted to show this one off in its own thread, being one of the scarcer coins I own for my budding Japanese type set:
Japan
"Hoei Tsuho" 10 mon, 1708
Obverse:
Ho-ei-tsu-ho (Hoei Circulation Money)

Reverse:
Hei-kyu-sei-yo (For the everlasting use of the world / long-circulating currency) countermark Chin (Precious)

Japan was one of the last Asian countries to hold out against the
colonizing trade pressures from the West. Christian missionaries were sent in to spread Western values and turn the peasantry against their feudal lords. Sensing the threat, the Shogunate declared Sakoku, or closed borders, in 1638. All western religions were outlawed, and all non-Japanese were forcibly expelled; foreign trade was prohibited, as was emigration.
By about 1700, the copper mines started to become exhausted under the pressure of producing bronze Mon coins to fuel the economy. Japan could not import copper, so a new solution was needed. In 1708, emperor Hoei commissioned a huge bronze coin to be worth 10 smaller Mon, while containing only about 3 mon worth of copper. The coins were marked as "precious" meaning they were to circulate alongside silver coins. These coins were too large to be wieldy for daily commerce, and their relatively low face value was not popular either. After briefly attempting to force the populace to adopt these coins, the towel was thrown in, and the coins were recalled.
In 1768 under continued pressure, the 4 mon coin was introduced, to much more widespread acceptance. The 1 mon were made until 1869, being continually debased with iron until they were switched to 100% iron, and bronze reserved for the 4 mon and massive 100 mon coins.