I'm curious why you would think that's a proof coin minted in SF instead of one of the 424,470,400 1968 dimes minted in Philadelphia. Short answer is no, don't be excited.
Since you posted on the What's it Worth forum, the answer is 10 Cents Here is some great information on the subject. If any new memeber does not yet know about the rarity. 1968 10C No S (Proof) Roosevelt Dime - PCGS CoinFacts
Everybody has a duh moment once in a while. At least you properly called it No S instead of that silly "no mint mark" stuff.