Watson , co-discoverer of DNA , to sell Nobel Prize medal he won in the early 1950s . James Watson , Francis Crick and James Watson won for work on double helix structure . Auction will be the first time Nobel Prize has been sold by a living recipient . The world record price -- more than three times its pre-sale estimate -- made it the most expensive letter ever sold at auction . Gold medal is expected to go under hammer for $ 2.5 million to $ 3.5 million .
Watson , co-discoverer of DNA , to sell Nobel Prize medal he won in the early 1950s . James Watson , Francis Crick and James Watson won for work on double helix structure . Auction will be the first time Nobel Prize has been sold by a living recipient . Gold medal is expected to go under hammer for $ 2.5 million to $ 3.5 million .