Any tips for antiqued metal materials?

[charlie_peckar]

There are a lot of renderings of antiqued coins in my future. Likely thousands. Does anyone have any tips for setting up a material that does at least some of the antiquing automatically? It'd be pretty cool to avoid texturing each one by hand if I can!

My knowledge of procedural materials is pretty basic, so any and all tips are very welcome!

Example picture for reference.

What do y'all think?

[glorybound]

Have you looked at the new Chaos materials (TriplanarTex)? Here is a quick Google search for old metal

https://www.youtube.com/watch?v=GGvVMt-IqAU

[Buck]

v-ray dirt. if the coin surfaces are geometry/displaced.