Karen, there is no way we could see that the dime is missing the 'S'. Can you take a better picture of just the dime? Also, I beleive this is an uncirculated set, not a proof set. So the dime would actually be a Philadelphia minted dime, therefore no mint mark.
It means it was minted at Philadelphia. Philly minted coins didn't have mintmarks that year. The reason the nickel and one of the cents has an S is they are San Francisco minted. The mint just stuck them in the sleeve with the Phillys.
Yes, you have 20 of them because they are extremely common. The plastic token in the sleeve with that dime states that the sleeve contains coins from the San Francisco and Philadelphia mints- and the only SF coins for circulation in 1968 were the cent and nickel. The dime, quarter, and second cent carry no mint mark because they were minted in Philadelphia.
karen, just to give you an idea about the 1968 No S dime, there are estimated to be about 15 of them. They are worth up to $35,000. There are 424,470,400 no mint mark Philly coins, like the one in your mint set. They are worth about $1.
Although they're not worth a fortune, they're still cool to have. The Kennedy 50 cent piece is 40% silver and makes the set really worth what it's worth.
Thank you for your help. I just got alot of his coins and I've been going through them so I might have some more questions later. Thanks again.
It does. The missing S means the uncirculated Mint set was struck at Philadelphia and Denver. Blue is Philadelphia and red is Denver. The missing S mintmark was in regards to proof dimes in 68, and no one knows exactly how many made it out of the San Francisco Mint that year, but they do exist.