What are Adjustment Marks on Coins?
What are Adjustment Marks on Coins?Adjustment marks appear on many pre-1840 coins, although they are most frequently seen on coins dated prior to 1821. These marks are sometimes confused with roller marks and other imperfections created during the coin minting process, but once you understand what caused adjustment marks, you should almost always be able to diagnose them for what they are.Answer: Adjustment marks, also called weight adjustment marks, are file marks on the surface or edges of silver and gold coins minted prior to about 1840. Adjustment marks are most frequently encountered on U.S. silver coins from 1821 and earlier. The reason these file marks were made on the coins was to ensure that the coin was of exactly the proper weight. Adjustment Marks and Overweight Coin Planchets Prior to the early ninteenth century, the mint lacked the technology to create coin
