The ichibuban was a type of gold coin in the Edo period, worth one quarter of a ryō.
Full term for the same coin; 一分判 is the common abbreviation.
ichibubankin; Edo-period rectangular gold coin worth one quarter ryō
Abbreviation of 一分判金 (ichibubankin). The term combines 一分 (ichibu, 'one bu', a unit of weight/currency) and 判 (ban, 'seal' or 'stamp'), referring to a stamped coin of one bu.