Strike doubling, push doubling and slide doubling are all types of machine doubling that are similar striking errors but are so minor that they don’t add much value to a coin. These are caused by a loose die but it is NOT a Doubled Die. All strike doubling is considered machine damage and will show on the sides of the letters, numbers and bust as a flat shelf-like doubling, and is actually a flat on the side of a design element were the die actually pushed or slightly gouged the metal as it retracted from the coin’s surface just after it struck the coin.
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