Brown coin that's supposed to be made of Nickel plated steel?

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kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 24 Nov 2013, 00:40 #
Posted: #
I have a brown coin that's supposed to be made of Nickel plated steel.

Probably a stupid question but -Can anything turn steel brown while still keeping all details of the coin intact? Or would it most likely be counterfeit? The size, ridge spacing and details seem right.....

It's a 2009 Guyana $10 coin by the way.

Thanks for your responses! (Please be nice)
redsmithstudios
Joined: 20 Dec 2010
Posts: 3064
Posted: 24 Nov 2013, 02:25 #
Posted: #
photos please, its probably just dirty
Taking a break from swapping for a while, but still interested in pre 1799 Spanish coins, I will make time for that!

Looking for pre 1783 coins
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 24 Nov 2013, 02:40 #
Posted: #
Quote: redsmithstudiosphotos please, its probably just dirty
Maybe, but it doesn't look like any of the dirty coins I've got.
My uncle said it feels like copper but I'd like a second opinion.






Thanks!
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 24 Nov 2013, 02:41 #
Posted: #
And sorry about the photo quality.
sujit_kumar Catalogue referee
Joined: 11 Jan 2013
Posts: 2360
Posted: 24 Nov 2013, 07:23 #
Posted: #
Maybe copper plated (post mint)?
“A man without a hobby is only half alive.”
Franklin Delano Roosevelt
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 24 Nov 2013, 12:45 #
Posted: #
Quote: sujit_kumarMaybe copper plated (post mint)?
Possibly. No idea why anyone would do that though. The gov't issued one is nickel plated steel and I found this in a cash register. Pity there's no-one here that can take a look at it. (Coin collecting is nearly non-existant here. There aren't even any coin shops in the capital city! The commentaries and coin sets at the national bank are the closest we come to it.)


Does that last part even make sense?
tony.c
Joined: 27 Feb 2010
Posts: 783
Posted: 24 Nov 2013, 19:56 #
Posted: #
intense heat may cause color changes, mostly brownish
World coins by date and mint place, 1850-2000
ZuluRaptorSpace
Joined: 3 Jun 2013
Posts: 1628
Posted: 25 Nov 2013, 04:24 #
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Non-selected trial strike, or perhaps to test the design?
Cerulean
Joined: 1 Nov 2010
Posts: 1915
Posted: 25 Nov 2013, 13:55 #
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When it has been buried underground for a long time, nickel turns brown.  It is a function of the acidic nature of soil and rainwater.  I see this effect with USA nickels, dimes and quarters that I find outside in playground wood chips.
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 25 Nov 2013, 18:00 #
Posted: #
Thanks for you explanations/suggestions everyone! Main Point is it's an interesting keep.
redsmithstudios
Joined: 20 Dec 2010
Posts: 3064
Posted: 30 Nov 2013, 17:31 #
Posted: #
This look like copper to me. I think it's either an error, or a trial strike; ether way, great coin.
Taking a break from swapping for a while, but still interested in pre 1799 Spanish coins, I will make time for that!

Looking for pre 1783 coins
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 30 Nov 2013, 17:56 #
Posted: #
Quote: redsmithstudiosThis look like copper to me. I think it's either an error, or a trial strike; ether way, great coin.
It's magnetic....I don't think anyone has a list of Guyana error coins.  8. Thanks though.
ZuluRaptorSpace
Joined: 3 Jun 2013
Posts: 1628
Posted: 30 Nov 2013, 19:40 #
Posted: #
Copper plated steel?
Kuna Catalogue referee
Joined: 18 Feb 2013
Posts: 874
Posted: 30 Nov 2013, 22:52 #
Posted: #
Can You tell me, please, the year?
If it is magnetic, then it should be maid of steel or nickel. Probably it is copper plated steel or nickel.
Regards
Kuna
Check my doubles ;)
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 1 Dec 2013, 00:06 #
Posted: #
Quote: KunaCan You tell me, please, the year?
If it is magnetic, then it should be maid of steel or nickel. Probably it is copper plated steel or nickel.
Regards
Kuna

2009. It's got a scratch on it now though. :( My cousin took it and bit it.
Kuna Catalogue referee
Joined: 18 Feb 2013
Posts: 874
Posted: 1 Dec 2013, 10:37 #
Posted: #
Quote: kpr007
Quote: KunaCan You tell me, please, the year?
If it is magnetic, then it should be maid of steel or nickel. Probably it is copper plated steel or nickel.
Regards
Kuna

2009. It's got a scratch on it now though. :( My cousin took it and bit it.
If it is from 2009 it couldn't be  trial strike. Probably it is the new variety of the coin which isn't issued till now, but there is also a second option and that is an error.
Regards
Kuna
Check my doubles ;)
dptashny
Closed account
Posted: 1 Dec 2013, 15:28 #
Posted: #
I think it is just dirty.
cyprusalexander
Joined: 4 Nov 2013
Posts: 929
Posted: 3 Dec 2013, 08:07 #
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This change comes after been issued by mint.

No need to keep as something special. Just a sample of what could happen during circulation.
Alexander from Cyprus
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kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 4 Dec 2013, 13:28 #
Posted: #
Well my cousin bit it and it's got copper in it. So my guess is it's a contemporary counterfeit with a magnetic core because the original (and unchanged) make-up of the coin is nickel plated steel. Guyanese coins aren't exactly hard to counterfeit. The government mainly puts its efforts into the notes.

Just out of curiousity - Anyone here have keep contemporary counterfeits?

Thanks for all your contributions btw!!  :D
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 4 Dec 2013, 13:37 #
Posted: #
Unless, in regards to Cerulean's post, all of the nickel turned brown and not just the upper layer. Regardless of whether its a counterfeit or just dirty it's a keeper to me (along with some other oddly damaged coins I've found).

Again thanks for your answers!! :)
ZacUK Numista team
Joined: 3 Jan 2011
Posts: 16691
Posted: 4 Dec 2013, 14:03 #
Posted: #
Quote: kpr007Just out of curiousity - Anyone here have keep contemporary counterfeits?
South Africa 1 Pond 1896   https://en.numista.com/catalogue/pieces9791.html

          

  Supposed to be gold, and in daylight this forgery does have a little gold-plating still showing.


I got these two in change recently - counterfeit UK £1 coins. Both are mis-aligned; on left is 2000 with dragon reverse but wrong edge lettering, on right is 2001 with Celtic cross reverse and correct edge lettering. I don't collect them, and had not seen any for a while.
Token collector [1600-1899] with some coins
kpr007
Joined: 17 Oct 2013
Posts: 26
Posted: 4 Dec 2013, 14:52 #
Posted: #
Quote: ZacUK
Quote: kpr007Just out of curiousity - Anyone here have keep contemporary counterfeits?
South Africa 1 Pond 1896   https://en.numista.com/catalogue/pieces9791.html

          

  Supposed to be gold, and in daylight this forgery does have a little gold-plating still showing.


I got these two in change recently - counterfeit UK £1 coins. Both are mis-aligned; on left is 2000 with dragon reverse but wrong edge lettering, on right is 2001 with Celtic cross reverse and correct edge lettering. I don't collect them, and had not seen any for a while.
Sweet!!  :D Unless you paid for them thinking they were real. Then owie. (I know technically you did kind of spend $$ for the £1 ones - so unless you have a lot then interesting find and let's hope it only happens once.)
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