Mintmark used to designate that the coin was struck at the US mint in "Denver Colorado". Back between 1838 and the civil war the "D" mint mark was used by the US mint in Dahlonega Georgia.
Term used for the gold coinage struck at the branch Mint in Dahlonega, Georgia from 1838 to 1861 and for the coinage struck at the branch Mint in Denver, Colorado from 1906 to the present.
Small tooth like raised areas around the edge of a coin. Particularly on older coins. Often found all around the front (obverse) and back (reverse) of the coin, right next to the edge.
A coin that shows numbers or letters doubled. Caused by the coin die having been made with a doubled design on parts of it. Example: 1955 double die Lincoln cent.