What is the value of an 1820 US half dollar?

Two varieties of half dollar were struck that year. The first has a normal date and the other has a "recut" date that occurred when an engraver attempted to use a die that was left over from the previous year. This type has a "19" visible underneath the "20".

Numismedia lists the following approximate retail values as of 02/2010:

Normal date:

Very worn condition - $66

Moderately worn - $110

Slightly worn - $186

Almost no wear - $818

Uncirculated - $1,770 to $24,380 depending on quality

Recut date (1820/1819)

Very worn condition - $89

Moderately worn - $127

Slightly worn - $312

Almost no wear - $1,458

Uncirculated - $2,730 to $25,680