MUHAMMAD ALI's Vietnam War draft card is going up for auction - more than 50 years after the boxer's dramatic act of defiance.

The legendary heavyweight refused to join the U.S. Army when drafted in 1967.

Ali was convicted of draft evasion and stripped of his boxing titles.

He was also banned from the sport and spent the next three years facing jail, before being spared by the Supreme Court.

The draft card has been provided by Ali's family to auction house Christie's.

It features Ali's birth name - Cassius Clay Jr. - and strikingly does not include his signature.

The document could fetch a remarkable $3 million to $5 million, the auction house has estimated.

"Being reminded of my father's message of courage and conviction is more important now than ever," said Ali's daughter Ra

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