according to the us government and your local bank
a $1 federal reserve note and a $1 silver eagle are both worth the same $1 if you try to spend them or deposit them in your account
same with a pre 1965 quarter , dime or half dollar
now when you say not trading the same, that is a whole nother story
if great grandad rat holed $20 back in the day
better hope it was a gold piece and not a paper 20
debase the money and you debase the country