Collectible coins encompass various types, including those issued by the United States, such as the Kennedy Half Dollar. The Kennedy Half Dollar, introduced in 1964, is significant for honoring President John F. Kennedy following his assassination. Specifically, the 2004 Kennedy Half Dollar, minted as part of the ongoing series, is sought after by collectors and can be found in different grades and conditions, impacting its value in the marketplace. The term "N A" typically refers to coins that are not applicable for specific grading categories or those that are uncirculated.