King of Na gold seal

[1] The seal is believed to have been cast in China and bestowed by Emperor Guangwu of Han upon a diplomatic official (envoy) visiting from Japan in the year 57 AD.

This dimension roughly corresponds to the traditional Chinese standard unit of length of one cun, as used in the Later Han dynasty (about 2.304 centimetres [0.907 in]).

[5] The five characters engraved on the seal are (in the order in which they are to be read): The meanings of these characters (in the context of this seal) are: "Han" (referring to the Han dynasty of China), "Wa" (an ancient name for Japan), "Na" (an ancient kingdom / state within Japan), "state / country", and "ruler."

[3] After being lost for an undetermined period of time, the seal was reportedly rediscovered on April 12, 1784, on Shika Island in Fukuoka Prefecture, Japan.

According to contemporary reports, the seal was discovered by a farmer named Jinbei while repairing an irrigation ditch.