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Why not just make that out of a flat piece of metal, or even a plank of wood though? Why bother with the very complicated 3D shape that took a lot more work to make?
Are all the sides equal on this dodecahedron? Maybe its for multiple coin types?
The holes through the holes are usually different sizes but I don’t think any two examples are exactly alike. And you could have a board with several holes drilled in it to test multiple coin types.
Also, did the Roman empire issue 12 different sizes of coin?