This photo of a big japanese historical gold coin with the embosed replica of the National Diet Building of Japan and on its back the House of Representatives is in the possession of my friend's friend. Perhaps the japanese would like to redeem it from them. Anyone who can help them find their way to the Japanese embassy or to Japan?
The building of the National Diet of Japan comprises the House of Representatives and the House of Peers, much like the British House of Lords, consisted of high ranking nobles.
Symbolism
The National Diet is the seat of power of Japan. It is the center of the country’s political strength where branch of knowledgeable aristocrats are tasked to formulate legislations. The imperial family through wisdom, wealth and force of character exercises indirect authority over men, things and events to make, amend, repeal laws of the nation in obedience to customary practices and traditions.
On top is the Imperial Seal of Chrysanthemum. No one is permitted to use the Imperial Seal except the Emperor of Japan. Within the seal, at the middle, is the Emperor’s Signature and Privy Seal in Constitution in the Empire of Japan. It is Japan’s official seal or the State Seal of Japan.
From both sides of the Imperial Seal are the leaves of Chrysanthemum. Chrysanthemum in the Greek word, means golden flower. It is a flowering herb and there is a Festival of Happiness in Japan that celebrates the flower. Chrysanthemum Throne is given to the position of Japanese Emperor and the badge or crest of the emperor of Japan, therefore the flower represents the emperor and Imperial House.
Small Japanese words encrypted below the item could be referring to a name of person, most likely hold ownership of the artifact.