With only a little over four million Franklin half dollars struck at the San Fransisco Mint in 1953, these are already rare coins. They're even more rare when all the lines on the ...

It's all about silver content, minting errors, and condition when it comes to the value of Kennedy half dollars.

5 Most Valuable Kennedy Half Dollars. Although some Kenndy 50-cent pieces are worth only about 50 cents, others fetch thousands at auction. It's all about rarity, silver content, and condition.