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 the mint. The die variety coins may be a slight modification to the approved impressions on the working dies that make coins. It’s late in 2022 […]
Category: Educational Series
MintErrors.org Educational series, in which we discuss all sorts of die varieties and error coins.
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 types of error coins with photos Planchet error coins are focused on issues related to the planchet itself. These planchet error coins may have occurred whether […]
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 the situation at hand. Prior to cleaning a coin, it is best to know that by doing so, cleaning a coin will: Alter the appearance of […]
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 it a coin. Machine doubling is more than likely due to the configuration of the minting press, which is set up by humans. Add in the […]
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 clad quarter in your hand, but this coin seems awful thin for a quarter. You pull out another clad quarter and compare. The suspect quarter sure […]
Amazing Lamination error coins – Educational Series
What is a Lamination error coin? How are lamination error coins made? What is the value of a Lamination error coin? We will answer these questions on Lamination error coins and show some dramatic examples. What is a lamination error coin? Lamination issues occur well before the coin is struck. Let us go all the […]
California Fractional Gold varieties – Arms of California
California Fractional Gold varieties are rare and unique. Shown below is an 1857 California Fractional Gold varieties called “Arms of California”. We will focus on the reverse of this California Fractional Gold variety. California Fractional Gold varieties – 1857 California Gold Charms, Arms of California – Wreath #5 The Arms of California, California Fractional Gold […]
Lincoln Cent Struck on wrong planchet – A pair of 1945 Lincoln Cents on Ethiopian planchets.
Attribution of 1945 Lincoln Cent struck on wrong planchet. This is one way to tell if you have a Lincoln Cent struck on wrong planchet. A customer came up to our table at the Weyer’s Cave, Virginia coin show and had a few coins that he would like to know if the information provided on […]
What is an OMM (over mint mark): Educational Series
A mint error produced by the mint that is working die related The over mint mark (OMM) series in the Lincoln Cents is special. Two over mint mark error coins occurred in the 1940’s, in close proximity to the 1943 copper cent and the 1944 steel cent. Today we are going to look at the […]
Amazing struck on wrong planchet 1966 Lincoln cent on clad dime planchet
A nice struck on wrong planchet error coin. This is a 1966 Lincoln Cent struck on a dime planchet. Let us examine this struck on wrong planchet coin and think of ways that this struck on wrong planchet error can occur. How are struck on wrong planchet coins made? In order to have a slim […]
Russia Mule error coin double reverses !
Unique Mule error coin created with two reverse dies. A very unique Russian Mule error coin. This Mule coin was made with a 10 Ruble reverse die and a 2 Ruble reverse die. I typically surf about a half dozen or more auctions houses a day in search of some dramatic error coins that will […]
How are off center coins made?
How off center coins are produced Off center coins are typically created when there is a malfunction in the minting press. When a minting press is producing coins normally without any errors, a planchet is fed onto the anvil die. The collar then surrounds this blank planchet. The hammer die then strikes or squeezes the […]
Amazing struck on wrong planchet major mint error coin!
1976-S Proof Bi-Centennial Kennedy Half Dollar struck on wrong planchet. We recently had the pleasure to purchase and attribute a 1976-S Proof Bi-Centennial Kennedy Half Dollar struck on wrong planchet major mint error coin. This extremely rare Proof Kennedy Half Dollar is certified by PCGS and given a grade of Proof-67 with Deep Cameo properties. […]
Major mint Error coins from India – Multi-Struck coins
In this post we will chat about a major mint error that I purchased from India. Today we will talk about some multi-struck coins which are considered to be major mint error coins. I wanted to purchase more than a dozen of the multi-struck errors, so I could have a wide variety as well as […]
Capped Die Major mint error
I have a source within India who I am working with to obtain some World Coin major mint errors. He offered me a lot of five, 25 Paise major mint error coins from India. The lot was not specific on what each coin was. I thought this mint error coin lot was decent in price, […]
Error & Variety Collectors – Join CONECA
A society for error and variety coin collectors The Combined Organizations of Numismatic Error Collectors of America (CONECA) is a great organization to offer education about coins, error coins and die varieties. CONECA (pronounced: CŌ´NECA) is a national numismatic organization devoted to the education of error and variety coin collectors. CONECA focuses on many error […]
Educational Series: What is a Doubled Die?
A Doubled Die is a term in coin collecting used to refer to doubling in the design elements of a coin. Doubled dies can appear as an outline of the design or in extreme cases, having design elements and dates appear twice in an overlapping fashion. Doubled dies can be seen on the Obverse or Reverse of the […]
Educational Series: What is a Repunched Mint mark?
How to tell if a coin is a Repunched Mint mark (RPM) Since Repunched mint marks have not been made since the mid 1990’s, I get a lot of questions about them from the younger coin collectors. They know repunched mint marks exist but they don’t know to what extent and on which denominations. Time […]