Year of Issue: 2016 Country of Issue: Cook Islands Mint: Mayer Mint Face Value: 20 Dollars Coin Weight: 3 Troy Ounces Metal Purity: 0.999 Metal Composition: Fine Silver Mintage: 333 Features: Ultra High Relief For the Haliotis collection’s fifth anniversary and its most exclusive coin yet: the Haliotis Ovina, everyone! While the world knows little about this ancient, extinct species of sea snail (also known as the sheep’s ear abalone), this coin is able to capture its beauty and brilliance on this three ounce, fine silver coin. An Ultra-High Relief and genuine Pearl insert brings the Haliotis Ovina to life once again in jaw-droppingly beautiful detail.