1964 dimes are certainly not collectible. They made 2.2 billion dimes in 1964. You can buy them in $1000 bags most anytime you want. You just have to pay for their silver value. Most Roosevelt and Mercury dimes are not collectible, but they are valuable because they're made of 90% silver alloy. So their cost/value is related directly to the market price of silver. The silver is what gives them their value back in 1964 and today. The price you pay changes daily based on the silver bullion price.
It is what they call hard currency.
It's what USA money was based on prior to 1965. A paper one dollar bill was redeemable for 1 ounce of silver.
Your money today is called fiat currency.
