Dragonfire's Blog

05 Apr 2022

Three Minting Errors and How They Occur Part 1

Coins-United States | Dragonfire

Today, I am going to be doing a blog on three types of coin errors, doubled die coins, broad strike coins, and single-face coins, and how they are made.

The first of these three errors is the double die. To understand how a double die coin is made, first you have to understand how the die is made. The die of any coin is made by heating up the die to soften it, then using a hub, which is basically the stamp that is used to make the dies, to stamp an image onto the die, which will later be used to stamp the coin. Until 1996, the dies had to be struck with the hub two or more times. The workers would use guides to make sure the hubs did not strike in multiple places on the die, but sometimes a die would still get struck with the hub in multiple places. Then, when one of these dies that had multiple hub strikes in different places strikes a coin, it creates two impressions in the coin. A die can sometimes have three or four hub strikes. Since 1996, dies only need one strike from the hub, but the number of double die coins being minted has increased since this change.

The second error I am going to be writing about today is a broad strike error. During the minting process, a coin is put into a collar, then the obverse and reverse dies are struck together to place their impressions on the coin. The collar that is placed around the coin is used to decide which rim to use, whether it is smooth, reeded, or lettered. The collar is also used to make sure that the metal does not expand too much when struck. A broad strike coin is created when a coin is struck without the collar. The metal that the coin is made out of expands, like when you push down on a ball of dough. Sometimes a broad strike coin can get bigger than a quarter. Because the collar controls whether the rim is reeded or lettered, and the blank that is used to strike the coin has a smooth rim, the edge of all broad strike coins are smooth.

The third and final error I will be writing about today is the single face coin. As I mentioned in the section about broad strikes, the minting dies are struck together to place their impressions on the coin. A single face coin is created when two blanks are stuck together during the strike. One blank receives an obverse design and no reverse, and the other receives a reverse strike and no obverse.

Sorry that there are no pictures. I do not have any of these errors on my coins.



Level 5

Interesting explanation. Thanks for sharing.


Level 5

Join CONECA! Great resource for error collectors.


Level 6

Really enjoyed your blog! Errors are the coolest! ; )

AC coin$

Level 6

Thanks again for your explanations regarding this sorts of minting errors. It is quite a venture to grab coinage with damages that might translate into value.

I. R. Bama

Level 5

Thanks for a very educational blog!


Level 6

Good job. Are you a CONECA member? Thanks.


Level 7

The plan het is struck once for a business strike Two or three for a proof coin. Good blog in-house it

AC coin$

Level 6

You wrote a comment in my Euro coin blog regarding James the Apostle. Santiago de Compostela's Cathedral is dedicated to James, The Elder of the two brothers. His body was found in a boat ashore, as the legend claimed. THANKS for your comments always. What I expose and write I have read and gathered from my knowledge and books. Pointing further for you, Luke 9:54, Mark 3:17 and 9:38. Best regards.

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