If the image is centered on the coin blank like a normal nickel, you probably have a common error called a filled die. These are generally not worth anything extra.
If the coin is struck off-center, its value depends on how much of the image is still visible.
In any case, error coins almost always have to be examined in person by a knowledgeable dealer or appraiser.
Realistically, five cents. It's too common and recent a date to be worth more.
It's a common date nickel that's only face value. Spend it.
It's not possible to give an answer without a date. Look for questions in the form "What is the value of a US nickel?" for specific information.
If it has no date, it means that it got worn off.
15x its face value if you can read the date
9.0000
This date is still found in circulation and is only face value.
The "f" is not a mintmark but rather an initial. With out a date it is impossible to tell the value of your coin. Most buffalo or Indian head nickels aren't worth much. Post a new question and structure it like this to ensure an answer- "What is the value of a <date> US nickel" or " What is a <date> US nickel worth".
Check that date and try again. The nickel didn't come out until 1866.
Half-dimes were tiny (14 mm) coins issued up till 1873. The reason your coin is the size of a nickel (21 mm) is that it IS a nickel. However, without a date it's not possible to give a specific value. Please enter a new question in the form What is the value of a [date] US nickel? for a specific answer. (date = your coin's date)
1927 is not a rare date. This coin is commonly called either a buffalo nickel or an Indian head nickel. Please see the question "What is the value of a 1927 US nickel?" for more information.
The value would depend on the condition and date of the coin.