和同開珎 わどうかいちん Also written わどうかいほう Meanings Noun wadō kaichin (i.e.: Japan's first circulated coinage (minted in 708 CE)) See also: 和銅 (わどう). See also: 富本銭 (ふほんせん). Kanji 和 harmony. Read as ワ. 同 same. Read as ドウ. 開 open. Read as カイ. 珎 precious; valuable; rare. Read as チン. Jinuma: Japanese Dictionary · Word lists