This is the U.S. Indian Head Gold $5 Coin.

There are different files .STL. For example 2.3mm_Overall has overall thickness 2.3mm. All the coins have diameter 26.05 mm. Weighting:

-1.55mm_circle: yellow gold 14K = 13.68g, silver sterling = 10,86g;-1.55mm_Overall: yellow gold 14K = 5,54g, silver sterling = 4,4g;-2.3mm_Overall: yellow gold 14K = 8,13g, silver sterling = 6,46g.

Other files for export, like .OBJ, .FBX, etc., has overall thickness 2.3mm.

Also there is file Coin.blend in this project. You can change whole the model, because all modificators had saved in this file.

If you have any questions, please, write me, I'm ready to help you!