World's Rarest Stamp Goes to Auction

The British Guiana One Cent Black on Magenta could fetch $20 million.
1:54 | 06/17/14

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Transcript for World's Rarest Stamp Goes to Auction
-- -- Famous and valuable stamp goes on the block tonight at Sotheby's 7 PM here in New York City mayor and -- -- the British. Yeah I'm not one sentence. That's stamp which has its own security guard and his right here in our studio now for a special guest appearance hello god is worth an estimated. Ten to twenty million dollars so -- that right there yes. This is for its size and its way up -- you know I don't. I'm -- It is. For its size and weight the most valuable item in the world and tonight hit the auction just starts at 7 PM is the only thing wow -- the the option. David and David the Redmond has been here advising me on the importance of this -- it's it's the only one of its kind it was lost it was found. And now stamp collectors everywhere will be vying for the best the Mount Everest if you well of -- stamps. Why if it weren't so much is because it's so cold that David you're here might write I'm like yeah it's really quite what -- -- -- -- -- -- -- next. The British we'll honor that. Is the man leaves it's tested in this mostly in the staff of the world for the last 100 years its cost to the greatest extent collections in the world it was spit on by. George the fifth of of -- -- -- -- Stephanopoulos. Yeah there was -- I can't comment on what I don't -- originally about making 56 but since then that people look up his vary capitalist David. We wish you the best of luck play offense tonight -- and I don't recognize I hate it when I talk I use my hands on the Long Island -- to -- remove the Rihanna. Thanks a security man -- immediately announced. And good luck of the public security at neverland now his eyesight I never left understand -- -- -- -- -- -- --

This transcript has been automatically generated and may not be 100% accurate.

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