What is the value of an 1805 US nickel?

Answer 1

It is worth 5 cents.

The U.S. did not mint nickels until 1866. Please take your coin, turn it over very carefully, and look at the date to the right of Jefferson's portrait.* You'll see 2005, the year this Westward Journey commemorative was issued to mark the Lewis and Clark Bicentennial.

(*) And in any case, Jefferson would have totally disapproved of the use of his image on a coin while he was president! That was the practice in Britain, and in 1805 the U.S. was only 25 years away from the Revolutionary War.