Nelson Mandela and former U.S. President Bill Clinton look to the outside from Mandela's Robben Island prison cell in Cape Town, South Africa, in this photo from March 27, 1998.

Mandela, referred to as Madiba or Tata (Father of the nation), who was later to become President of South Africa, spent 18 of his 27- year jail term in Robben Island prison. He never gave up.

Nelson Mandela and former President Bill Clinton look to the outside from Mandela's Robben Island prison cell in Cape Town, South Africa, March 27, 1998. (Associated Press) ...

South Africa has demanded a halt to an auction of the key to the prison cell on Robben Island once occupied by former President Nelson Mandela. The sale is due in January in New York by Guernsey's ...

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Watch a clip of The Mandela: Long Walk To Freedom actor sharing his prison experience on Oprah's Next Chapter airing this Sunday. Must-See: Idris Elba on Staying in Robben Island Prison Cell For ...

Nelson Mandela and former U.S. President Bill Clinton look to the outside from Mandela's Robben Island prison cell in Cape Town, South Africa, in this photo from March 27, 1998.

Mandela, referred to as Madiba or Tata (Father of the nation), who was later to become President of South Africa, spent 18 of his 27- year jail term in Robben Island prison. He never gave up.

New York auction house Guernsey's has postponed the sale of some of the South African leader's belongings, including the key to his cell and the shirt he wore when he was released from Robben Island.