How rare is the 1955 copper penny?

The 1955 US copper cent is not rare. The USA minted 330,958,200 of them at the mint in Philadelphia and another 563,257,500 of them at the mint in Denver. However, during the time the Philadelphia mint was producing their 1955 cents, ooe of the dies used to stamp the coins was not perfect and the coins made from it are known as the 1955 double die error. It is not known how many of these errors left the mint and were placed into circulation. These coins sell today [June 27, 2009] for about $1500 in better circulated grades and between $2000 and $3000 in uncirculated grades.