Coins from this particular group of Japanese coins all bear the inscription
"Kanei Tsuho," and are denominated as 1 or 4 Mon. The name comes from "Kanei," which is the name of an era in Japan from
February, 1624 until December, 1644, and "Tsuho," or precious goods/valuables/money.
The reason that the coins bear this inscription is, as with most cast Japanese coins,
to signify that it was currency of that era. For information on how these cast coins were
created, please see my article on the casting of pre-Meiji Japanese coins here.
Find information on the 1 Mon Japanese coins here.
Find information on the 4 Mon Japanese coins here.