What is the value of an 1912 liberty head nickel?

That is very dependent on the mint mark if it has no mark or a "D" mint mark it is fairly common with values as little as $1 to over $60 depending on the condition of the coin (grade). If it has a "S" mint mark it is a rare coin and can be valued anywhere from $100 to over $1000 depending on the grade of the coin.The only way to get an accurate valuation is to take it to a coin dealer and get an opinion that way, its very hard to give a value without seeing the coin.