The S mint mark on a dime dated 1984 indicates that it was a proof dime minted in San Francisco for inclusion in special sets sold to collectors. My guess is that someone broke up the set and spent the coins for face value .... not a wise move, because what was formerly a coin worth maybe 60 cents as part of a set worth 7 or 8 bucks, is now only worth a dime.
1941 Winged Liberty Head/Mercury Dime: With no mint mark, in fine condition is worth $0.70, uncirculated is worth $17.00, proof is worth $175.00. With D mint mark, in fine condition is worth $0.70, uncirculated is worth $17.00. With S mint mark, in fine condition is worth $0.70, uncirculated is worth $20.00.
No mint mark - $2 to $4 depending on wear "S" mint mark - $2 to $15
The "S" is a mint mark not a stamp, but the value is $2.00-$3.00 for circulated coins and a mint state coin is $7.00
With no mint mark next to Monticello, or a "D", it's worth about a dime. If there's a small "S", it's worth about a quarter.
If the mint mark is D or S the dime could be worth from $2.50 to $90.00 depending on the condition. If not, then it's just worth the price of the silver unless it's in uncirculated condition.
You have a Liberty Seated Half Dime - a 1869-S coin in good condition (G4) is worth: $20.00; if its mint state is MS60, the value increases to: $400.
A 1970 Uncirculated Mint set would not have a dime with a "S" mintmark, only a Proof set will have a dime with a "S" mintmark for that year, so no your mint set is not rare.
The 1934-D Mercury dime with the "S" mintmark is fairly common and is worth its silver value. As of now, the coin is valued for around $3 to $5 based on its silver content. Condition and rarity can also affect the value, so it's best to consult with a coin dealer or appraiser for an accurate assessment.
With no mint mark and in average condition, about a dime. With a "D", about a quarter. With an "S", around 35¢
The only mint marks on a 1952 dime would be an "S" for San Francisco and a "D" for Denver. Please examine the mint mark on your coin again since some are not stamped clearly or have some sort of damage from being in circulation.
Average value is $15,500.00. If you think actually you have one. It must be certified as authentic.
As of 12/2008, Numismedia quotes the fair market value (FMV) at $1310.00