Fuhonsen coin
Historical term for Japan's earliest known coinage, minted around 683 CE. It may never have been widely circulated. Often mentioned alongside 和同開珎 (Wadōkaichin).
See also: 和同開珎
The Fuhonsen is considered to be an older coin than the Wadōkaichin.
There is debate over whether the Fuhonsen actually circulated.