That is exactly the set I have in the same envelope. Does the nickel in the blue have an S? I was mistaken the quarter and the dime both in my set have no mint mark.
Sorry for such a lengthy delay. I did something to my PC which created a few problems for me in transferring my pictures. But, I got it figured out and am posting some pictures of the mint set I was talking about earlier. Here are photos of this 1968 Mint Set
Amber green your dime is worth 10 cents. You can spend it. None of the US coins in 1965, 1966 or 1967 have mint marks, even though they were produced at all 3 mints. A 1967 dime is not special. It's a dime.
I have a 1968 Proof set. There are two sets, one package has a dime with D mark. The other set does not have a mark. Both packages are still in the plastic so it is hard examine. My father bought these each year of my birthday. Would this be the no-S dime since it is in the proof set (unopened)?
What you describe there is actually a Mint Set of Uncirculated coins, not a Proof set of Proof coins. Only a Proof 1968 dime without the "S" mintmark is the error. The Uncirculated coins from Philadelphia all lack mintmarks.
Welcome, newby! I've been coming to this site for a long time, but didn't post often. While I was ecstatic over the info you can glean here, I was horrified by the so-called experts who would jump on the newbys posts criticizing them for the questions they asked. I thought the point here was coin lovers sharing information, instead of the more expert practically calling them stupid. I say ignore them and LOL at how pitiful their lives must be. BTW, there are many highly knowledgeable experts quite willing to share and help. Terri
To be fair to newbies and the general public, the distinction between proof and business strike coins is easily missed until you know the difference (which by then is obvious). So it isn't surprising that this one trips a lot of folks up.