Bermuda Humpback Whale Silver Two-Dollar 1993 Commemorative Coin in Mint Condition. The Bermuda Monetary Authority has authorized the Royal Mint to strike a limited number of Proof silver coins. The 1993 coins are the fourth in a five-year series of crown-sized coins bearing designs based on Bermuda's flora and fauna. The reverse design, modeled in the Royal Mint Engraving Department, features the Humpback whale - Megaptera novaeangliae (big winged New Englander).