1976 National Bicentennial Medal. Large Format. Silver. 76.1 millimeters. 253.9 grams, 8.25 troy ounces. By Frank Gasparro. Swoger-52IAb. Mint State.,In fitted case of issue, one of just 9,459 examples sold in this impressive large size, struck by the Philadelphia Mint. Antiqued matte silver patina.