The 18-carat gold chrysanthemum-styled cufflinks were given to driver Alec Irvine in 1921 by the then Crown Prince of Japan, on his historic six-month tour of the UK and Europe.
The visit, five years before the Crown Prince became Emperor in 1926, was the first time that a member of the Imperial family had ever travelled overseas. They are expected to sell for about £1200 at Bonhams, in Queen Street, on December 13.
Clare Blatherwick, head of jewellery and silver at Bonhams, said: “They appear to have been barely, if ever, worn. They look untouched. They are extremely elegant and very rare – I’ve never seen a record of any other sold.
“There will be wide appeal not only among collectors of jewellery but also those with an interest in history and this remarkable story. I would expect interest from Japan as well as Scotland.”