It depends on what you mean by mis-stamped. Please feel free to ask the question again an include more detail.
It's the usual practice of this site to answer a single question at a time. Please see:"What is the value of a 1940 US nickel?""What is the value of a 1942 US nickel?""What is the value of a 1944 US nickel?"
This design is called either a buffalo nickel or an Indian head nickel; both names are about equally common. Please see the question "What is the value of a 1919 US nickel?" for more information.
The US nickel was first issued in 1866. Please double-check your coin.
Error coins need to be seen. Take to a coin dealer.
5 cents.
A 1957 nickel is worth face value only, unless it's uncirculated or a proof coin.
In average condition, both coins are only worth their face value.
From 1982 to 1999 all Canadian nickels were made out of the same 75% copper / 25% nickel alloy used in US nickels. That alloy doesn't contain enough nickel to be attracted to a magnet.
Check that coin again. The first U.S. nickel was issued in 1866.
Average current retail value is $5.00
This famous design is also frequently called an Indian head nickel. Please see the question "What is the value of a 1920 US nickel?" for more information.
Liberty nickels were made from 1883 to 1912. Your coin is a familiar Jefferson nickel. Please see the question "What is the value of a 1939 US nickel?" for values.