What is the value of a 1983 Kennedy Half Dollar without a mint mark?

Please double-check your coin. All half dollars minted in 1980 and later have mint marks regardless of where they were struck, so your coin should have a P or D above the date if it's a circulation coin, or an S if it's a proof.

There have been no reports of missing mint marks on 1983 Kennedy halves. If it does not have a letter, you should take the coin to an expert who specializes in error coins.