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Coinage presses strike coins at different speeds. Some coinage presses strike 120 coins per minute per die, while others strike up to 400 coins per minute per die. One even strikes 700 coins per minute per die. At this speed, malfunctions can happen.
The planchet is feed into the coinage press and rest inside the collar on the anvil die (Reverse die). After being struck, the anvil die moves upward, raising the coin. Now the coin is suppose to exit the coinage press and go to a collecting area.
If the coin does not eject properly and falls partially inside the collar, it is struck again. This is how we get Double Struck or Multi Struck coins. The second, third, four, etc, strike is totally at random. It is possible for the coin to settle back inside the collar and be struck the second time on center. This is very rare, put it does occur.
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