This is proof coin. "S" of this dime is made from material as in regular coins. Is this a common practice or it is exception? At the same time and the "s" style is different, I think so.
I really don't understand what you are asking, but I'll try to help. The style of S is correct. It is MMS-008 (Tall S). It was the only style used in 1968. It was used from 1952-1955 & 1968-1974. It is a proof. As for a different material being used on the S, that is not possible. It is the same material as the obverse layer. As the coin is struck, the metal flows into crevices on the face of the die, to create the letters & numbers.
Thanks a lot. But "S" really looks different as a material. So, as you know all letters and date of proof coins look as silver and have shine. This "S" has no shine and is gray. I have a lot proof coins and for fist time I see such "S".
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