The coin is likely damaged, but take it to a coin dealer or collector, error coins need to be seen for an assessment.
9.0000
The value of a misprinted $50 bill with an error on the watermark can vary depending on the nature and rarity of the misprint. Collectors may be interested in such bills, and their value could potentially exceed face value. It is recommended to have the bill authenticated and appraised by a professional in order to determine its precise value.
The value would depend on the condition and date of the coin.
100-700 usd
July 25, 2009 The value of a circulated Jefferson war nickel is based mainly upon the value of the silver they contain which is $0.78 today. In uncirculated collector coins the values vary greatly with the year and mint mark. To establish an estimated value for an uncirculated Jefferson war nickel, the year and mint mark must be known.
It may be a little older but is very common, just face value.
$2 to $9000 depending upon the mint mark and the condition of the coin.
The coin is still found in circulation and is face value
Without seeing the mark it is difficult to give an estimated value. The mint did not intentionally make a nickel with a mark above the head but sometimes damage to the dies will create a mark. I would suggest you take it to a coin dealer who can actually see what you have and perhaps can give you more information about it.
Just 5 cents
A date is needed. Please post a new and separate question.
This will vary greatly depending on date and mint mark.