1968, 1970 and 1975 no mint mark on any. Not sure if mint m8ssing is the S.

I put my penny collection to rest for now. I have 2 1968 cents, 2 1975 cents and a 1970 cent. I looked up how to spot a a proof coin. I looked at the obverse fields to see if there flashy or mirror kind reflection. I looked at the rims, the defenition of device clear motto date. I need help, opinions and /or recomending me helpful web sites.

 

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Those are all normal circulation strike dimes. If you are looking for no "S" proof coins, you won't find them in circulation.

 

Based on your pics your 68 and 75 appears to have a slight MAD the 75 to the left PMD 70 also PMD all very well circulated coins.JMO
Dave

 

One way to learn how to spot a proof, is too look at a lot of proof coins. Easiest thing would be at a coin show or shop. However, if you can google (1968-s proof set for example) and look at the images. Not necessarily the best way, but it will be a start.

As @l.cutler said above. You aren't going to find these in change. It is unusual to find any proof in circulation For it to get into circulation, somebody would have to break open the hard plastic holder and decide to spend the coins at face value. Out of the millions of proof sets sold during those years, there are only a few hundred (or less) known with the no S. So you would have to have the low probability occurrence of somebody breaking open a proof set and the coins, that just happens to be the very, very probability occurrence of being a No-S set. Theoretically, it could happen, but theoretically, it's possible to flip a coin and have it land on the edge.

BTW: If you haven't done so, I very strongly recommend buying a Redbook. best $12-15 you'll ever spend on the hobby (or buy an older copy for a few bucks at those overstock stores)

 

Another way to get a good idea what a proof coin looks like is just go to ebay and buy one of the year of the year you are interested in (or at least a pre 1973 and post 1973 one and possibly a recent one as well, surface quality and finish varies.) They are cheap. You can get a 68 S, 75 S, and 95 S proof dime for around $6 total including shipping.

 

These pictures are Philadelphia mint Roosevelt dimes (not cents) and not proof.

 

Generally these no S coins can not be found in circulation.
If it looks like a worn regular dime, it is a worn regular dime.
More than half the coins have no mintmark before they started putting the P on.

 

If it looks like this but without the s, it is a proof...otherwise not.

 

Not even close. But good ask