John R. Sinnock, the designer of the coin.
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It isn't a "JS" (and JS isn't the mintmark, the mintmark, if any would be found on the reverse) dime. It is a Roosevelt Dime, the JS are the designer's initials. It is silver, however, and worth around $2.15 in silver content.
It's just a silver Roosevelt dime worth about a dollar
It is a JS, standing for John R. Sinnock, the designer of the Roosevelt dime.
It's a Roosevelt dime not a JS dime and all are considered common, value is about $2.00.
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 ounceExample: .07234 X $40.00 = $2.89This is just the value in silver, not the collectors value.