We recently made a discovery that Coin World has published in their weekly paper. Proof Ike dollars and Kennedy halves are known from the 1970's which are struck on aluminum coins or tokens. Until now, it was unknown what token or coin these proof Ike and Kennedy halves were struck on, but we did some research and were able to figure it out by clsoely examing a proof 1970-S Kennedy half and a proof Ike dollar that we have in our inventory.
Read the article here on Coin World's website: https://www.coinworld.com/news/us-coins/2017/10/1970s-coins-struck-on-aluminum-game-tokens.html
Coin World just recently reported the existence of a 3rd known example of the remarkable two-tailed Washington quarter mule. The coin has two reverses, and as such cannot be dated, but it is believed to date back to the 1960's.
The full article can be found on Coin World's website: http://www.coinworld.com/news/us-coins/2017/09/pcgs-certifies-two-tailed-washington-quarter-dollar.html?utm_medium=Email&utm_source=Lyris&utm_campaign=DigitalEdition
Do you feel like you know the difference between a mint error and a "damaged" coin? Do you know the difference between an error and a variety? If not, you should take the ANA's correspondence courses ""The Modern Minting Process", and "U.S. Minting Errors & Varieties." They are excellent courses which will teach you all the fundamentals (and more) about errors and varieties. You will then have a solid foundation to grow and learn as an error or variety collector.
Here is a link to the ANA's correspondence courses: https://www.money.org/diploma-program
For those of you who are not members, CONECA is the no.1 error coin club in the United States. It has approximately 650 members across the U.S. and around the world, with members participating in writing articles for the club journal "Errorscope", and with annual club meetings held in conjunction with the ANA World's Fair of Money. The club also is a excellent way to connect to the "experts" in the hobby, as well as other error coin collectors.
If you are not a member, we strongly recommend it. Here is a link for more information about the club: http://www.conecaonline.org
To join, you can sign up here: http://conecaonline.org/content/join.html
Above Image via Coin World
The Denver Mint is very concerned about catching any errors before they make it out of the Mint, as this article details. Interestingly, the Mint employs a tool for catching rotated dies, and also for checking the coin's thickness. Additionally, the article shows photos of the Mint employee visually checking coins (which is done every 15 minutes.) The odds of a cud getting out are slim.
Here is a link to the Coin World article (be sure and view the photos in the article.) http://www.coinworld.com/news/us-coins/2017/08/denver-mint-still-production-workhorse-for-circulation.html