I made 3D model collection of yen coins with Blender. It includes 1, 5, 10, 50, 100, 500 yen coin.
All of them have head, tail and side materials. And the materials are engraved by displacement with black/white texture.
I made original black/white textures for displace by hand in Inkscape.
Displacement texture for other coin is simply generated by black/white converter to original coin texture.
The node setting below is head of 100 yen coin.
The basic material is mixture of glossy and anisotropic shader.
Displacement takes responsibility of engraving on coin.
The noise texture is used for bump and roughness on the surface.