An almost complete 10th century Samanid chess set from Nishapur in modern day Iran will star in a sale of Islamic art at Sotheby's London on April 20.
The set is valued at £20,000-30,000 ($28,677-43,015) and comprises 16 figures.
It's consigned from the personal collection of chess grandmaster Lothar Schmidt (1928-2013), the referee for the 1972 "Match of the Century" between Bobby Fischer and Boris Spassky.
Dr Thomas Thomsen, president of Chess Collectors International, said: "In my 40 years' experience, I am not aware of any other chess set from this period".
Please sign up to our free newsletter to receive exciting news about unique item auctions.