Certain 50-cent pieces are valuable, but this depends on the year, type and condition. For example, an About Uncirculated (AU-50) 1921 50-cent piece may be worth $84,900. This is because there are fewer than 200 examples. Most twentieth-century pieces are of a value less than $100, while some dated before 1900 may be worth up to $1,000. There are also some rare Canadian dimes and nickels.