2017 World of evolution echinoidea 1 oz silver coin. ECHINOIDEA – SEA URCHIN FOSSIL – WORLD OF EVOLUTION – 2017 1 oz Pure Silver Antiqued Coin – BURKINA FASO. ONLY 500 PIECES WORLDWIDE! The World of Evolution series celebrates some of the sea creatures that lived many years ago. This coin is dedicated to the Echinoidea and it features a Sea Urchin fossil. This comes in a case, and certificate of authenticity. Credit / debit card.