In 2002 a 1933 double eagle sold for over $7.5 million.
However, not every 1933 double eagle floating around is going to be worth that much. The reason is that other than the 1933 double eagle sold in the 2002 auction, no other 1933 double eagle is legal to own.
No 1933 double eagles were released for circulation, however 445,500 were minted and all were supposed to have been melted down. Some though escaped the mint and the US Secret Service has seized nearly 20 coins that had escaped the mint because they believe that they are still technically the government's property. The reason one 1933 double eagle is legal to own is because the US government issued an export certificate for it in 1933 to allow it to be exported to Egypt before realizing that no 1933 double eagles had been released for circulation.