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Message:: [QUOTE="Treashunt, post: 297598, member: 6763"]dave: In order:   1) "From what years were mintmarks hand-stamped onto Lincoln Cents and for what reason would they change it? "        No years. The mintmarks were punched into the dies, never onto the individual coins.  2) "Also, what does the term "extra thickness on the outer devices" mean? " This refers to a type of doubled die. A certain class of doubled die that is noticable as extra thickness on the lettering.3) "is it possible for coins that are double dies, for example a 1936 cent, to later be stamped with either an S or a D mintmark thus making it a different variety? "  Sure, but that is called damage and destroys the coin. And, no they cannot add a mintmark in the way that you describe by 'stamping' it into the coin. That would cause the mintmark to be incused (into the coin) and not raised as it normally is.However, fakers can add mintmarks in a way that us mere mortals would find very difficult to determine.[/QUOTE]