Ichibuban

The {{nihongo|Ichibuban|一分判}} was a monetary unit of Japan.The Cambridge History of Japan: Early modern Japan by John Whitney Hall p.61 [https://books.google.com/books?id=k_BrQL4Pn0QC&pg=PA61] The Ichibuban was a gold coin that was worth a quarter of a Koban.

The gold Ichibuban of 1714 (佐渡一分判金) had a weight of 4.5 g, with 85.6% of gold and 14.2% of silver. The silver Ichibuban from 1837 to 1854 (Tenpō Ichibugin, 天保一分銀, "Old Ichibuban") weighed 8.66 g, with an alloy of 0.21% gold and 98.86% silver.Toi Museum

The Nibuban (二分判) was worth double the Ichibuban, and half a Koban and was also a rectangular coin.