I stand corrected - a quarter is indeed just a quarter. If anyone wants to send me all of their tarnished old pre-1964 quarters and dimes I will cheerfully send you back crisp dollar bills for those exact face-value amounts. I’ll even pay postage!
My point was that prior to 1964 American coins had intrinsic value. The value of a 1964 silver quarter now is pretty much exactly what it was in 1964 - $3.50 in today’s money. A 1965 quarter made from nickel and copper is still worth 25 cents.
I know what you meant. You have to get a person willing to pay extra for the silver coin before you can spend it.
Says your 1964 quarter is worth $4.29. (If I'm reading it correctly)