Coin Community Family of Web Sites
Like us on Facebook! Subscribe to our Youtube Channel! Check out our Twitter! Check out our Pinterest!
Username:
Password:
Save Password
Forgot your Password?


Welcome Guest! Need help? Got a question? Inherit some coins?
Our coin forum is completely free! Register Now!

1966 Washington Quarter Clamshell Separation ?

Next Page | Last 15 Replies
 
To participate in the forum you must log in or register.
Author Previous TopicReplies: 16 / Views: 505Next Topic
Page: of 2
New Member

United States
5 Posts
 Posted 08/05/2022  6:19 pm Show Profile   Bookmark this topic Add surfacewave to your friends list Get a Link to this Message
Found this in change yesterday, it has been around the block a few times. To me the reverse shows mippling effect which I am guessing is caused by the die deteriorating. You can also see the copper core reeding in the image. I have trying to educate myself, let me know your opinions of this coin
Added reverse





Edited by surfacewave
08/05/2022 6:47 pm
Pillar of the Community
United States
547 Posts
 Posted 08/05/2022  6:40 pm  Show Profile   Bookmark this reply Add cointagous to your friends list Get a Link to this Reply
I don't believe the rim was struck that way but has metal wear over time causing metal movement. Something that would happen from being rolled on it's edge such as a dryer could have caused this.
Edited by cointagous
08/05/2022 6:43 pm
Pillar of the Community
United States
4790 Posts
 Posted 08/05/2022  7:01 pm  Show Profile   Bookmark this reply Add Adam_E to your friends list Get a Link to this Reply
This coin was buried in acidic soil for some time. The acid ate away at the copper more than it did the nickel, so the copper core receded into the coin quicker than the nickel did.
Pillar of the Community
United States
563 Posts
 Posted 08/05/2022  8:34 pm  Show Profile   Bookmark this reply Add oddguy to your friends list Get a Link to this Reply
i agree with some sort of acid being in ground or type material.
Bedrock of the Community
Learn More...
United States
58840 Posts
 Posted 08/05/2022  8:36 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
The clamshells look more like these coins:


Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
Pillar of the Community
Canada
2886 Posts
 Posted 08/05/2022  9:09 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
I do not see clam shell effect here. What I see it is a coin which liked to take a acid bath. Sorry, not clam shell.
Bedrock of the Community
Learn More...
United States
10427 Posts
Bedrock of the Community
United States
45798 Posts
 Posted 08/06/2022  05:20 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
I think it is acid damage.
John1
( I'm no pro, it's just my humble opinion )
Searched 6.5 +/- Million Cents Since 1971
Pillar of the Community
United States
3282 Posts
 Posted 08/06/2022  10:28 am  Show Profile   Bookmark this reply Add Kopper Ken to your friends list Get a Link to this Reply
Nice discussion coin...would acid dissolve copper more efficiently than CN...why would the acid dissolve the copper right in the middle? Any chemists out there?

KK
Bedrock of the Community
Learn More...
United States
10427 Posts
 Posted 08/06/2022  2:13 pm  Show Profile   Bookmark this reply Add Dearborn to your friends list Get a Link to this Reply
oh, ok, I see it better in the daylight. Not a partial collar. It is an acid dipped quarter.
The copper core is a softer metal than the copper/nickel cladding and will dissolve quicker than the cladding.
Pillar of the Community
Canada
2886 Posts
 Posted 08/06/2022  4:05 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
To answer at the KEN question: The cooper dissolve in nitric acid (HNO3) acid solute. But this acid is not easy to have or be find in the nature. When I see the coins like this I go and the studies confirm that the coins was in contact with citric acid.

What happened: The core cooper is in fact an alloy of Cu-Zn. The citric acid dissolve the zinc not the cooper and the clad will be slow corroded.

Manny other reaction could be possible with different bases, acids, in special mild acids. If the coin was in one lab or goldsmith plant could has interferences with potassium chloride or cyan hydrate of potassium.
Pillar of the Community
United States
3120 Posts
 Posted 08/06/2022  7:41 pm  Show Profile   Bookmark this reply Add Petespockets55 to your friends list Get a Link to this Reply
I'm with Dearborn about this being a tilted partial collar strike as well as having been in a caustic environment (acidic).
Take a look at OP's images 3 & 4.
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
Pillar of the Community
Canada
2886 Posts
 Posted 08/06/2022  8:16 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
@Pete: with your permission please. We employ the word caustic for corrosive reactions. Is a popular form to say corrosive environment. The word caustic referee just and limited to organic tissues and not to metals. Hope one day in the future the young generations will be more precise then us now.
Pillar of the Community
United States
3120 Posts
 Posted 08/06/2022  9:43 pm  Show Profile   Bookmark this reply Add Petespockets55 to your friends list Get a Link to this Reply
That's interesting Silviosi.

I didn't realize caustic was a term only for organic tissue but it makes sense.
Now I just have to reprogram my POM. (Petespockets Old Memory. )
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
Pillar of the Community
Canada
2886 Posts
 Posted 08/06/2022  10:25 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
in my case I will say SOSM (Silvio Old Stupid Memory). Stupid come from all crazy thinks I do or test. Few days ago I do 'it involuntary Trinitroglycerin and go to smoke near my cigar LOL

I neutralized and destroyed now, but I was not far to put 6 neighbor to sleep in the park LOL.
Pillar of the Community
United States
3120 Posts
 Posted 08/07/2022  07:49 am  Show Profile   Bookmark this reply Add Petespockets55 to your friends list Get a Link to this Reply
After smoking near the nitroglycerin, did you make it onto the local news channel? LOL
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
Edited by Petespockets55
08/07/2022 2:05 pm
Page: of 2 Previous TopicReplies: 16 / Views: 505Next Topic  
 
To participate in the forum you must log in or register.





Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2022 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited.
Contact Us  |  Advertise Here  |  Privacy Policy / Terms of Use

Coin Community Forum © 2005 - 2022 Coin Community Forums
It took 0.38 seconds to rattle this change. Powered By: