Love the model! These are printed at 50% scale, the bronze ones with 0.3mm nozzle and gold with 0.5mm nozzle. Bronze is Gizmo Dorks bronze fill PLA, gold is CC3D silk gold PLA, black overlay is AmazonBasics PETG. Aside from looking pretty, I was using these prints to test surface quality while adjusting a variety of slicing parameters.
EDIT: adding new photo after painting some of my coins. Used Vallejo acrylic black and gunmetal grey, some at full strength and some diluted.