I do wonder how a somewhat valuable metal like copper would work here. The copper standard. Go by the weight of the coin times the spot price of copper. Then the govt can’t keep printing more but I gyess they’d have to be on board
A slug about 2 inches in diameter, 1/4 inch thick, is worth about 1 USD at today's copper price (weight = 1/4 pound).
So it might almost, but not quite, work as coinage. Maybe in a very poor country populated by body-builders.