Four characters - Kuan Ei Tsu Ho Blank. 28.5mm, 4.81 grams. Edo (Tokyo mint), issued 1769-1788. Hartill 4.252.
Most Japanese coins are very rare. These coins are, however, common - they were inspired by the Ming dynasty cash from China. "Kwan Ei Tsu Ho" means "Universal Treasure of Kwan Ei". The coins were minted from 1769 to 1860 - these brassy large pieces were minted in the earliest Meiwa period, from 1769 to 1788. These coins carried the denomination of 4-mon and carried 11 "waves" on the reverse.