Who cares? Stupidity is its own reward. Gold and sliver coinage have been used for thousands of years and people quickly learned how to test the coins for authenticity. That's what a "touchstone" is for. Also, in the old days, merchants kept a piece of marble or granite on the counter and would "ring" the coin against it. A true coin makes a clear bell-like sound, while a counterfeit makes a dull "clunk." That's where the phrase "rings true" comes from.Svartalf wrote:but would the average guy one the street recognize a struck coin from a molded one?
plus the actual method of manufacture doesn't mean a thing to shaving and recasting the shaving for blanks.
Coin-operated newspaper machines can detect slugs completely mechanically. They do two things; they weigh each coin and if the weight is not exactly correct, they reject the coin, they also test for density and rebound characteristics by bouncing the coin against a bar. If the coin does not hop the bar properly, it's a slug and it's rejected. It's really pretty ingenious how those mechanisms work.
Today, I believe mass-measuring devices are available that can detect the density of the coin and decide if it's gold or base metal.
Such devices and techniques will emerge and become commonplace should such coinage be in widespread use. I imagine that a sensor fitting into you smart phone capable of measuring the electrical resistance and capacitance of a coin to determine its authenticity might be possible.