What is a 1964 JS silver dime worth?

1964 was the highest mintage year for Roosevelt silver dimes, most are valued for the silver at about $2.50.

NOTE: The letters JS you see are the designers initials, all Roosevelt dimes have them and they add nothing to the value.

With the high silver prices only Mint State coins have higher values.
.07234 troy ounce X Silver Spot @ $40 troy ounce

Example: .07234 X $40.00 = $2.89

This is just the value in silver, not the collectors value.