Shown item is old gilt copy of rarest gold Japanese coin.
The characters on these coins are ascribed to Kibi no Mabi , another well known calligrapher. The Kaiki Shoho was undoubtedly the first of its kind in the islands and is the oldest surviving Japanese gold coin, there being only one remaining specimen in the collection of the Imperial Household. Since this time it has remained in the possession of the Imperial family. A small number of exact copies in gold of this coin were made some years ago and are now greatly sought after by collectors. 3mm Most likely it is latest copy.