1920 Maine Centennial Silver Half Dollar – Low Mintage – Early U. Composed of 90% silver and 10% copper, designed by Anthony de Francisci. This issue had a low mintage of just 50,028 coins. Displays clear details and natural tone with strong eye appeal. A key early commemorative type for serious U. Mint: Philadelphia (no mint mark). Composition: 90% Silver / 10% Copper. Silver weight: 0.3617 oz troy. Diameter: 30.6 mm. Designer: Anthony de Francisci. Condition: AU (Almost Uncirculated) – see photos.