Pure Silver Coin – Discovering Dinosaurs: Mercury’s Horned Face – Mintage: 10,000 (2022). Discover a dinosaur with bony “wings” on its head. A follow-up to 2021’s. Mercury’s Horned Face or. Is the featured star of our second. Coin, and the first things you’ll notice about this ceratopsid are the bony, wing-like protrusions on its head. […]