999 pure silver and carved mother of pearl on the inside. The Republic of the Cook Islands has issued a silver coin to commemorate the Nautilus, the submarines captained by Nemo featured in Jules Verne’s novels. The coin is part of the successful series Mother of Pearl Coins. This 5 oz coin consists of pure silver and its inner core is made out of real mother of pearl. Its mintage is strictly limited to only 750 pieces worldwide. The item “NAUTILUS 5 Oz Silver Coin, Cook Islands, Mother Of Pearl Silver 999″ is in sale since Tuesday, January 28, 2020. This item is in the category “Coins\Bullion\Silver\Other”. The seller is “badazz-bullion.motorcycles.collectables” and is located in adelaide. This item can be shipped worldwide.