Edo-period small silver coin
A lump of silver used as currency during the Edo period, similar to 豆板銀 (まめいたぎん). Historical term; not used in modern contexts.
See also: 豆板銀 (まめいたぎん)
Kodamagin is a type of silver coin that circulated during the Edo period.
Compound of 小 (small) + 玉 (ball, lump) + 銀 (silver), referring to the small lump-like shape of the silver currency.