Four characters - Kan Ei Tsu Ho / Blank. 23mm, 1.93 grams. Jumantsubo in Fukagawa, Musashi Province, cast around 1736-1739. Hartill 4.144.

Jumantsubo refers to a large, reclaimed marshland area in modern-day Tokyo's Koto-ku

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".