Mintage 2000 Superman $75 14-Kt Color Gold Coin. Certificate of Authenticity No. 1709/2000. Number: 125860 with a face value of $75 limited mintage of 2000, Composition is 58.33% gold and 41.67% silver proof. Weight is (g): 12 with a diameter (mm): 27.I also have the complete 75th Anniversary 7 coin set for sale (gold & silver). I'm open to any reasonable offer.