You won’t be able to engrave into a real metal coin with the Glowforge. You could mark it with Cermark, moly-d, or even maybe water…
There are various colored acrylics that try to mimic the look of metal, and several people have done wooden nickels; a wooden nickel can be painted or treated with rub-n-buff for a metallic look.
You could engrave a wooden/acrylic coin and then use it to create a mold to cast real metal coins.
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