1990 P Quarter

[Coindog]

Another estate auction find.
Missing clad layer both Obv. & Rev.
This is an article on how this error, however rare, does occur. The last part of the article is what would apply here.

https://www.coinworld.com/news/precious-metals/missing-clad-layer-does-not-always-imply-miss.html

[mustbebob]

In cases like this, it is better to just post the link to the web site. There are copyright issues with posting things like this, and I may have to remove the Coinworld stuff from your post.

[Coindog]

In cases like this, it is better to just post the link to the web site. There are copyright issues with posting things like this, and I may have to remove the Coinworld stuff from your post.

I understand and deleted it. I'll post the link. My quarter is 0.07 grams under weight.

[mustbebob]

Thanks Coindog. That saves us a bunch of potential headaches.

From what I understand, the clad layer on a quarter weighs approximately 1 gram, so something like this could be a missing clad layer. We should wait for an error guru to have a look and give an opinion.

[Coindog]

Mustbebob

Glad we avoided any headaches. Not a problem and I learned not to do that again.


According to the article by Mike Diamond in the link, he covers the process that would result in the type of error as this quarter. He also addresses how a coin such as this, where you would expect to see a weight loss of 1gram, isn't actually accurate. The weight loss could vary between approximately 0.01gr. to 0.15gr. He explains how the 1gram weight of the clad layer is made up for in the planchet manufacturing process.
It's an article worth the read.

[Coindog]

Thanks Coindog. That saves us a bunch of potential headaches.

From what I understand, the clad layer on a quarter weighs approximately 1 gram, so something like this could be a missing clad layer. We should wait for an error guru to have a look and give an opinion.

Mustbebob

Glad we avoided any headaches. Not a problem and I learned not to do that again.


According to the article by Mike Diamond in the link, he covers the process that would result in the type of error as this quarter. He also addresses how a coin such as this, where you would expect to see a weight loss of 1gram, isn't actually accurate. The weight loss could vary between approximately 0.01gr. to 0.15gr. He explains how the 1gram weight of the clad layer is made up for in the planchet manufacturing process.
It's an article worth the read.

[mustbebob]

Mike knows his stuff, but I do not know much (if anything) about missing clad layers. I think I saw one once! We will continue to wait for other comments as I am just not sure about this one.

[Coindog]

Mike knows his stuff, but I do not know much (if anything) about missing clad layers. I think I saw one once! We will continue to wait for other comments as I am just not sure about this one.

I'm going through coins from an auction. If I get five that need authentication and attribution I will send or drive them over to John Wexler. This one makes two examples so far, unless someone here can shed a more definitive light on it, although with a coin like this, only actual physical examination would suffice.

[Kloccwork419]

Im going with either burned or some type of chemical damage

[Coindog]

Im going with either burned or some type of chemical damage

That would be post mint damage. The problem with that idea is there would be a one gram weight loss or nearly one gram in both those cases. This quarter weighs 5.6gr. Read the article by Mike Diamond in the link I posted.

[Kloccwork419]

You cant determine how much anything would weigh with either case. The mint tolerance is +/-.23g so .07 is nothing. I suggest messaging Mike Diamond. IMO this is PMD

[Coindog]

You cant determine how much anything would weigh with either case. The mint tolerance is +/-.23g so .07 is nothing. I suggest messaging Mike Diamond. IMO this is PMD

I'm actually going to drop it off at John Wexler's office.