It is necessary to know the amount of wear and mint mark (if it has one) to be able to make an estimate of value. I would suggest you take your coin to a reliable dealer and have it appraised.
1951 is a common date. In average condition most are worth 10 to 30 cents. A 1951 nickel with an S mint mark next to Monticello would retail for about 50¢ if it was only slightly worn.
NO
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?"
The last buffalo nickels were made in 1938.
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.
It's worth about 7 cents for the metal content.
This is a very common Jefferson nickel that's still found in circulation. Unless it's uncirculated, it's only face value.
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.
The coin is only face value