The cricket ball Sir Garfield Sobers hit for his record sixth six in one over at Swansea has sold for £26,400.
Gary Sobers during his historic over at St Helen's
The West Indian all-rounder was the first to achieve the feat in a first class game in August 1968.
Two balls disappeared into the crowd and the one being sold was hit out of the ground on the last delivery of the over to be recovered in a side street.
Auctioneers Christie's had put a guide price of between £5,000 and £8,000 on the lot bought by an anonymous bidder.
A spokesman for the auction house said the price reflected the unique place the ball had in cricketing history.
"We are thrilled that such a historic relic from the game of cricket was so sought after," he said.
The ball was signed by Sobers two days after his six sixes
Sobers was playing for Nottinghamshire against Glamorgan at Swansea's St Helens ground.
According to Christie's three separate balls were used in the over.
The first two were hit into the crowd and reportedly returned to the umpires.
The third ball was used throughout the rest of the over and on the final delivery was launched out of the ground towards King Edward Road.
Newspaper reports at the time said it was found by a "keen-eyed" youngster in a gutter at St Helen's Avenue, adjacent to King Edward Road.
He returned it and two days later the ball was signed by Sobers in the pavilion.
It was later presented to the Notts supporters' association at Trent Bridge but the auction house would not reveal who was selling it - or who had bought it.
Dr Andrew Hignell, Glamorgan's archivist, said news of Sobers feat was reported around the world.
Sir Gary Sobers was playing for Nottinghamshire at the time
"It was the first time it had ever been achieved in first class cricket," he explained.
"I can remember sitting at home. I was only nine years old at the time and it came on the television on the main news bulletin.
"I would have to say it's one of the six most famous pieces of cricket footage there is."
But he said it was only by chance it was captured by BBC cameras.
"The BBC camera crew was there being trained to go off and do other things but at the end of the training they had kept the cameras rolling."
The ball, with its split seam and scuff marks, came with a certificate of provenance signed by Sobers, stating "this signed cricket ball was bowled during the over in which I [Sobers] hit six sixes off Malcolm Nash."
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