The physical dimensions of a United States half dollar coin struck in silver are characterized by a diameter of approximately 30.6 millimeters (1.205 inches) and a weight varying based on the silver content and specific design. These specifications are essential for authentication, collection, and historical study. As an example, the Kennedy half dollar, when composed of 90% silver (1964) or 40% silver (1965-1970), conformed to this diameter while exhibiting specific weight variances dictated by the alloy composition.
The precise measurement holds significant importance within numismatics. It aids in verifying authenticity, preventing counterfeiting, and cataloging coins within collections. Accurately determining the dimensions, weight, and metallic composition contributes to the coin’s value and its placement within a broader historical and economic context. These physical attributes, established by the U.S. Mint, have played a critical role in commerce and public perception of currency value throughout the period when these coins were in circulation.