What is the value of an 1801 US silver dollar?
If you have a genuine 1801 U.S. silver dollar, about 40 mm in
diameter, it should be checked by a dealer or appraiser and
certified. As of 05/2009 Numismedia quotes retail prices ranging
from $1100 in very worn condition to over $26,000 if
HOWEVER ... the market has been flooded with counterfeit early
dollar pieces over the last decade or so, so you should be prepared
to find out that the coin is not real.
And if you're using the term "silver" dollar to refer to one of
the small (26.5 mm) gold-colored dollars now in circulation, it's
not silver, not gold, and not 1801. It's made of brass and was
struck in 2007 to honor Thomas Jefferson (who was elected in 1801).
This particular coin has no added value.