The mint mark and condition determines whether or not the 1997 John F. Kennedy half dollar is rare or not. If the coin is mint marked "S," is in uncirculated condition and is the silver proof version, the coin is considered rare.
Only 741,000 1997 silver version half dollars were made. As of 2014, a silver half dollar from this year is worth a minimum of $57, according to CoinTrackers.com. This coin is 90 percent silver.
The non-silver version with the same mint mark is worth a minimum of $12, and 2.055 million of these coins were made. Coins with mint marks of "D" or "P" aren't rare at all. More than 19 million of each of these coins were made.