Ancient Japan Wado-Kaichin Silver Coin 708 AD oldest official Japanese coinage
junizeni orkocho junisen
Wadokaichin also romanized as Wado-kaichin or called Wado-kaiho, is the oldest official Japanese coinage, having been minted starting in 708 AD on order of Empress Gemmei. The coins, which were round with a square hole in the center, remained in circulation until 958 AD. These were the first of a variety of coins collectively called junizeni orkocho junisen.
" Wadokaichin" is the reading of the four characters printed on the coin, and is thought to be composed of the era name Wado ("Japanese copper"), which could alternatively mean "happiness", and "Kaichin", thought to be related to "Currency". This coinage was inspired by the Tang coinage named Kaigentsuho ( Kai Yuan Tong Bao), first minted in Chang'an in 621 CE. The Wadokaichin had the same specifications as the Chinese coin.