What is the value of an 1847 US half dollar?

Numismedia lists the following approximate retail values as of 11/2011:

No mint mark (Philadelphia):

Very worn condition - $30

Moderately worn - $54

Slightly worn - $77

Almost no wear - $305

Uncirculated - $600 to $29,060 depending on quality

"6" under the "7":

Moderately worn - $4,430

Slightly worn - $5,440

Almost no wear - $20,428

Uncirculated - $34,380 to $48,130

DISCLAIMER: The retail values quoted are the best available as of the date shown, but may vary significantly due to changes in the precious metals market. Also the wholesale (buying) price of a coin will be less than the selling (retail) price. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.