This coin is a 1973 Kennedy Half Dollar, minted in San Francisco, identifiable by its 'S' mint mark. It belongs to the series of Kennedy Half Dollars, which commemorates President John F. Kennedy following his assassination in 1963. As a Proof coin, it was struck with a higher level of care and detail, resulting in a mirror-like finish and sharp details, making it a desirable piece among collectors. The coin has a denomination of fifty cents (50¢) and is composed of Copper-Nickel clad over a Copper core. It has a diameter of 30.6 millimeters and weighs 11.34 grams. The mintage for this particular year and type is 2,760,339, indicating a moderate production level that can affect its rarity and value. As an item of currency from the United States of America, this coin represents not only monetary value but also a piece of history and artistry in coinage. Its Proof finish enhances its aesthetic appeal, making it a popular choice for collectors and numismatists alike.