How to notice a pre 1968 proof coin?

Even with plenty flat pack proof sets and many pre 1965 proof singles I don't know how to identify a pre 1968 proof coin. I noticed that most proof coins don't have cartwheel luster. Anyway can you tell me how to identify a pre 1968 proof coin.

Thanks,

 

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The same way you would recognize a post 1968 proof coin. I'm not sure I understand the question, or at least not the significance of 1968.

 

Actually Jallengomez - most post 1968 proofs have S mintmarks. Otherwise the prior ones look like a proof. I have found proofs dated as early as 1958 in nickel rolls and several 1962 examples also. I did find a 1965 SMS quarter, you can tell by the sharper and cleaner strike, in circulation last year.

 

I know about the mint marks, but the look is the same regardless.

 

Also, if you are holding the coin look and feel the edges as usually they are very pronounced.