What is a 1883 racketeer nickel worth?

Racketeer nickels are dated 1883. They were created when crooks realized that the new Liberty Head design only had the Roman numeral V (= 5) on the back but not the Word CENTS. The coins were almost identical in size to $5 gold pieces so "racketeers" plated them and passed them off as "brand new $5 gold coins". Fortunately the Mint responded by quickly changing the design to add the Word CENTS.

If your coin is dated 1903 it has CENTS on the back so it's not a Racketeer nickel. It's just an ordinary nickel that was plated for use in jewelry or something similar. Unfortunately that makes it an altered coin with very little value.