A transcription of the former Japanese emperor's monologue about wartime days is set to be auctioned in New York in December.
The late Emperor Showa gave his thoughts on key events before and during World War Two in hearings shortly after the war.
The text was transcribed by former diplomat Hidenari Terasaki. He served as the emperor's close aide and interpreter when he met US General Douglas MacArthur, the Supreme Commander of the Allied Powers, after the end of World War Two.
The auction house says the original copy of Terasaki's handwritten transcription reaches 173 pages.
It covers the 1928 assassination of Manchurian warlord Zhang Zuolin to the emperor's August 15th, 1945, radio broadcast announcing Japan's surrender.
The auctioneer says the notes contain the same content that was published in Japan in the 1990s and became a best-seller.
It says the original transcriptions were kept by Terasaki's family members who moved to the United States after the war.
Auction officials say the lot is likely to fetch a price of least 100,000 dollars when it goes under the hammer on December 6th.
They say they are thrilled to have been given the opportunity to sell the only extant copy of a document that is critical for the understanding of 20th century world history.