Minor Doubled Dies: Why More From Philadelphia Than Denver?

@Pete2226, we can only hope that things like this should be considered; it is for sure will bring positive impact to the coin collecting universe. Also, and remember if it is not in their books, newly error coin discovery, "expert" would not want to deal with it. More likely they will just used coins comparison. It is all.

2014 information still good for references:: Keep in mind machine, technology tools, things of doing, etc are now different from 2014. So we can expect and sees different types and looks of mint error etc. Example: pressure, strikes, speed impact etc.

Good morning, coin community. Everyone's opinions do matter. Here is my contribution, and my opinion is not intended to alter your views on things.

Story of Double Die Discovery:

Some collectors, including John A Wexler, found double die coins. According to his online bio, he is a high school mathematician.

The article explained: He "found his first double die error in 1971." The article did not specifically indicate what type of denomination or years of this coin, which was attributed by error/variety specialist Alan Herbert, known as "Answer Man". According to a Coin World article, Alan Herbert began his coin collecting when he was in his 30s.
According to John Wexler, he continues his coin searching: in 1972, he said the US MINT produced various 1972 double dies. The article did not indicate what type of denomination it was, and the article did not provide US MINT confirmation of these findings.

In his own words: During the 1970s and early 1980s, John Wexler served as "Hubbing Variety Statesian" for CONE and began writing for CONES club publication Errorgram". You can find this information on "Wexler's coins and Die Varieties.

Here are my varied opinions on Types of Variety.
According to the article, "counterfeit and altered Lincoln pennies were found during the 1960-1970s." The US. SECRET SERVICE warns about counterfeit coins created through plating, which was sometimes done for school science projects or other private purposes".

Here are my varied opinions on so-called true Double Die coins.
According to an online article, Infamous 1955 Doubled Die Coin: At the time of discovery US Mint did not officially confirm the existence at that time it occurred". It was the numismatic experts and collectors who publicized the error". The error was discovered by Mint employees shortly after striking had begun, but the Chief Coiner decided to let the coins circulate.

According to the online source, the "US Mint confirmed that a Working hub was Misaligned". The most famous example is the "1955 Lincoln Cent."

Mint non-confirmation: "At that time, the US Mint did not officially acknowledge the coins as a recognized error. They were simply viewed as defective and released into circulation". Happy hunting and stay informed.