2025 Samoa Neptune’s Trident 5oz 999 Silver Antique 3D Shaped Coin Mintage 399. From the depths of the sea to the height of coin innovation, this shaped coin leads the way. It has a worldwide mintage of only 399 pieces. Contains 5 oz of. Mintage of only 399 worldwide. A shaped coin with antique finish. Coin is presented in a box with a certificate of authenticity. Obverse: Features the coat of arms of Samoa. Reverse: Depicts a pattern that appears like leaf ribs. Sovereign coin backed by the Samoa government. Auctiva offers Free Image Hosting and Editing. Auctiva gets you noticed! Track Page Views With.