what kennedy half dollars are valuable

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Based on the provided information, the value of a Kennedy half dollar depends significantly on its year, mint mark, condition, and whether it is a special issue. The most valuable Kennedy half dollars are typically special collector's editions, such as proof coins, reverse proofs, and those with special finishes, particularly when they are in high-grade condition (MS60 or better).

Several specific issues are highly sought after by collectors. Among the most valuable is the 1998 S Silver Frosted Matte Finish Proof, which can be worth over $100. Similarly, the 2019 S Enhanced Reverse Proof is valued between $100 and $120. Another notable coin is the 2014 W Silver Reverse Proof, with an estimated value of $60 to $70.

Other valuable Kennedy half dollars include various silver proof issues from the San Francisco mint. For instance, the 1995 S Silver Proof is valued from $40 to $45, while the 1993 S and 1994 S Silver Proofs are estimated to be worth between $35 and $40. The 2018 S Silver Reverse Proof also falls in the $40 to $45 range. Coins like the 1996 S, 1999 S, and 2014 P Silver Proofs also carry significant value, typically ranging from $25 to $35 for examples in excellent condition.