Eiraku Sen 上市 Deposited
Originally a Chinese copper coin introduced into Japan in the fifteenth century and made the sole lawful currency of Japan in 1573. The piece was coined by the Ming Emperor Cheng Tsu in 1403-1425 and has the inscription YUNG LO TUNG-PAO. Eiraku Tsuho is the Japanese pronunciation.
- Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)