The cricket ball that was hit by Gary Sobers for six consecutive sixes in an over in 1968 is to be auctioned by Christie's on November 15.
The ball is considered to be in a good condition despite the battering it received when Sobers played Nottinghamshire against Glamorgan at Swansea on August 31, 1968.
He is the only cricketer in England to hit six sixes in an over in a first class match.
The unfortunate bowler was Malcolm Nash.
The only other cricketer to have matched the feat of hitting six sixes in an over was Ravi Shastri when batting for Mumbai against Baroda in Mumbai in 1985.
The cricket ball is expected to fetch up to £8,000 at the Christie's sporting sale.
Cricket enthusiasts recall that Sobers started the over by hitting the first two balls over the heads of mid-wicket fielders into the crowd. On the third delivery, Sobers went down the wicket and drove the ball into the pavilion enclosure and the fourth he pulled over the scoreboard.
The fifth ball was caught by Roger Davis on the long-off boundary. But in doing so, Davis fell over the ropes and after a consultation between the umpires another six was signalled.
On the last delivery Sobers hit the ball out of the ground into a nearby street, where it was recovered a day later by a youngster.
Nottinghamshire country cricket club archivist Peter Wynne-Thomas told the local media, "Sobers was the first person in the world to hit six sixes in an over in a first class match and he remains the only person to have done it in this country.
"There is some dispute over whether two or three balls were used during the over. What happened to the other balls is a mystery. They were probably given to the umpires and because Glamorgan supplied the balls they were likely to have been given back to the club."
The battered red leather 'Special County' ball, manufactured by Duke and Son, of Nottingham, signed G Sobers, with a certificate of provenance by the West Indian star, has a pre-sale estimate of £5,000 to £8,000. The person who has put it up for auction wishes to remain anonymous.
The bat, which Sobers used, was sold for a record £54,257 at an auction in Melbourne in 2000.