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Possible 20 Pence Mint Error

 
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Author Previous TopicReplies: 10 / Views: 322Next Topic  
New Member

United Kingdom
6 Posts
 Posted 07/24/2020  04:28 am Show Profile   Bookmark this topic Add cptDa55ter to your friends list Get a Link to this Message
I have come across a 1983 20 pence coin, it seems to have been struck on either copper or bronze, there is also a fletch of "silver" on one face. its also thinner than a regular 20p coin. how do I verify whether this is indeed a genuine coin?
New Member
United Kingdom
6 Posts
 Posted 07/24/2020  04:29 am  Show Profile   Bookmark this reply Add cptDa55ter to your friends list Get a Link to this Reply
I will attempt to upload a photo or two when I learn how to do so.
New Member
United Kingdom
6 Posts
 Posted 07/24/2020  04:47 am  Show Profile   Bookmark this reply Add cptDa55ter to your friends list Get a Link to this Reply

Pillar of the Community
United Kingdom
7476 Posts
 Posted 07/24/2020  04:48 am  Show Profile   Check NumisRob's eBay Listings Bookmark this reply Add NumisRob to your friends list Get a Link to this Reply
It is most likely to have been buried in the soil for a while: that usually turns cupro-nickel coins brown. If it weighs the same as a normal coin, then it will just have this environmental damage. I find dozens of brown 20p coins with my metal detector! The thinness could be due to corrosion in acidic soil or on a beach.

to the Forum! This is a great place to learn about coins!
Edited by NumisRob
07/24/2020 04:54 am
New Member
United Kingdom
6 Posts
 Posted 07/24/2020  04:55 am  Show Profile   Bookmark this reply Add cptDa55ter to your friends list Get a Link to this Reply
it weighs 4grams and is considerably thinner than a regular 20p
New Member
United Kingdom
6 Posts
 Posted 07/24/2020  05:01 am  Show Profile   Bookmark this reply Add cptDa55ter to your friends list Get a Link to this Reply
I used kitchen scales, unfortunately I have nothing more precise. the regular 20pence reads 6g this coin reads 4g
New Member
United Kingdom
6 Posts
 Posted 07/24/2020  08:03 am  Show Profile   Bookmark this reply Add cptDa55ter to your friends list Get a Link to this Reply
anyone have any ideas? especially on the process on finding out whether or not this is an actual error coin.
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United States
90004 Posts
Pillar of the Community
United Kingdom
7476 Posts
 Posted 07/24/2020  12:47 pm  Show Profile   Check NumisRob's eBay Listings Bookmark this reply Add NumisRob to your friends list Get a Link to this Reply
I would guess it's been buried in acidic soil for several years. I've dug up 20-year-old 1p coins that were about half their original thickness. The rough surface also seems to indicate corrosion.
Valued Member
United Kingdom
175 Posts
 Posted 07/24/2020  1:19 pm  Show Profile   Bookmark this reply Add Collector28 to your friends list Get a Link to this Reply
That's corrosion, and definitely been buried in acidic soil for a considerable period of time. The bit of "silver" might simply be the original colour, maybe something covered that bit from being touched or the dirt around that area was scrubbed off.
New Member
United Kingdom
41 Posts
 Posted 08/07/2020  10:11 am  Show Profile   Bookmark this reply Add tokenscot to your friends list Get a Link to this Reply
The 20p coin is exactly 5.0g so if you have a selection of new ones you can use them to test the calibration of your scales.
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