Your coin looks like it was minted at Philidalphia, not San Fransisco (as TypeCoin971793 pointed out). the P mm was first issued in 1942, for nickels, and was discontinued after 1945. It was re-enstated in 1979 for the SBA, and now all of our circulation coinage (exscluding the penny) has "the P" on it. Had to so some reaserch on this, quite interesting.
The only no S dime that's really valuable was struck in 1968 and it was a proof coin, yours is one made for circulation. It's one of 585,673,900 that was made in Philadelphia that year.
Keep searching though, you'll never know what you'll find....
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