Mercury is the name of a dime only.
That's a silver war nickel from WWII, which contains 35% silver. It's worth about $2.
The last Buffalo nickel was made in 1938. A 1942 dated Jefferson that has a large mintmark on the reverse is 35% silver and worth about $1.00. If it does not have the large mintmark just spend it.
A 1942 Mercury silver dime could be worth between $2.00 and $30.00 depending on its condition and grade.
The last Buffalo nickel was made in 1938. A 1942 dated Jefferson that has a large mintmark on the reverse is 35% silver and worth about $1.00. If it does not have the large mintmark just spend it.
1942 is a very common date, most are valued just for the silver, about $1.25
The value is $3 if it is in mint condition. $2 if circulated.
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 value just for the silver is about $1.10, better circulated coins can be $4.00-$6.00.
How much is a buffallo nickel worth
All U.S. nickels weigh 5 grams as issued.
In the US, a nickel is worth 5 cents.