So I finally found a used for my old coin collection.
I tried something different in the graph for these, instead of just using the metal material for the diffuse I used the multi-angle to Albedo to generate the coins image and then blended it with the metal material using the height map. This added some nice details in the flat areas.
1939 Canadian Silver Dollar
1977 US Silver Dollar
2005 Canadian Penny
1931 Canadian Nickle