about 12 years ago I seen a video that said about 1 in ever 70 something half dollars were 40%. So On my travels thru town I would pick up some rolls and check. It was a little more than what I was told but still close. Now I have 21 40% half dollars sitting in a container. They are worth about $8.50 each now.
Every so often I’ll find a silver coin in my change. As time has moved forward, this occurs less frequently.