What is a doubled die and how to tell them from worthless doubling It can be very exciting to see a doubled die under a Loupe or a microscope. DidRead More
Category: Educational Series
1972 Lincoln Cent doubled dies
1972 Lincoln Cent Doubled Dies obverse what to look for. 1972 Lincoln Cent Doubled Dies can still be cherry picked from rolls and coin shows. A very important point aboutRead More
Repunched mintmarks in shopping cart
Repunched mintmarks (RPMs) are being added to the shopping cart. We have hundreds of Repunched mint marks and we hope to have a good amount of repunched mint marks availableRead More
What are die variety coins?
Die variety coins – types & die variety coin attribution A die variety coin is an alteration to an existing die pattern, that was created by and used within theRead More
Types of error coins with photos
How to easily identify each types of error coins with photos. Many examples shown are types of error coins with photos. Types of error coins with photos Planchet Error typesRead More
New Major Mint error purchases – Part One!
We’ve purchased quite a variety of major mint errors over the past year. These major mint errors are in our shopping cart, as well as available at all the coinRead More
More Lincoln Cent CONECA RPM’s !
Found more Lincoln Cent RPM’s in the safes at the storage unit. Most of these are circulated and and housed in a Coin World Slab. I took the box ofRead More
Cleaning a coin? When should you do this?
Prior to cleaning a coin, it is best to logically approach the idea before cleaning a coin. Look at why cleaning a coin is either good or bad for theRead More
What is machine doubling or mechanical damage?
Why does machine doubling /mechanical damage occur? Machine doubling or mechanical damage is worthless doubling. Machine doubling may occur when the minting press strikes a blank planchet and makes itRead More
What is Struck on wrong thickness stock ?
How to determine if your coin has been struck on wrong thickness stock. Let’s do an experiment together. Let’s try to figure out this coin. Imagine you have a cladRead More