Four characters - Kan Ei Tsu Ho / Blank. 24.5mm, 3.13 grams. Yoshida, Mikawa Province, cast around 1637-1640. Hartill 4.23.

Most Japanese coins are very rare. These coins are, however, common - they were inspired by the Ming dynasty cash from China. "Kan Ei Tsu Ho" means "Universal Treasure of Kan Ei".