What is the value of a 1904 US 5 dollar gold piece?

This coin is also called a half-eagle. In lower grades its value is determined by the current price of gold.

Look on the back of the coin to see if there's a small mint mark letter below the eagle. It may be blank or there may be an S.

Numismedia lists the following approximate retail values as of 06/2010:

No mint mark (Philadelphia):

Very worn condition - $324

Moderately worn - $372

Slightly worn - $396

Almost no wear - $427

Uncirculated - $480 to $21,940 depending on quality

"S" mint mark (San Francisco):

Very worn - $324

Moderately worn - $372

Slightly worn - $396

Almost no wear - $440

Uncirculated - $1,110 to $10,630