ancient coin 3d model

use the uploaded image as primary reference a thick ancient bronze medallion, coin-like, solid object keep the same front design from the reference image: central engraved Chinese character, circular symbols around the edge modify: - make the object thick (10–15% of diameter) - add clear depth to engraving back side: engraved decorative patterns only, no text requirements: clean topology, animation-ready, quad-based mesh, no holes, no noise centered pivot, suitable for rotation animation