I was watching a CoinHelpU video and Daniel mentioned that “people come in and they don’t want Roosevelt dimes or Washington quarters. They want “constitutional silver”. They want Walking Liberty Halves and Mercury Dimes. But if you’re buying these for the silver what’s the difference between a 1946 Roosevelt Dime and a Mercury Dime? They’re both 90% silver and the same size. Same with 1964 JFK 90% silver Half Dollars and Walking Liberty 90% silver Half Dollars. Can someone please explain this phenomenon?