1x 2 Bu Ban Kin (Ni Bu Ban Kin) Gold coin from old Japan weight~3g These Ban Kin are historical Japanese coinage from the late Edo/early Meiji period. Their value is based on rarity, age, and numismatic significance, not on bullion content. These pieces were traditionally struck in a gold–silver alloy, and they are collected for their historical importance rather than precious-metal purity.