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Curious NGC Variety Attribution Change

 
 
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Valued Member
United States
78 Posts
 Posted 05/30/2016  11:39 am Show Profile   Bookmark this topic Add mlov to your friends list Get a Link to this Message
I have noticed that NGC has seemingly changed is variety attribution for the South Korean 10 Won coin from this:


Here, NGC are clearly attributing this 10 Won coin as the "Bronze" variety. Prior to July 16, 1970, the Korean Mint struck these coins on 88% Copper, 12% Zinc planchets. After this date, the Mint changed the coining metal for the 10 Won coin to 65% Copper, 35% Zinc planchets. This created two varieties for 10 Won coins dated 1970. Although both metals are actually brass, Korean collectors began calling these the "bronze" variety (the former) and the "brass" variety (the latter). The Krause SCWC gives these coins a separate identifier: KM-6 (for the bronze), and KM-6A (for the brass).

Now, it seems as if NGC isn't making a variety distinction. Look at this:

It doesn't look like they attribute the variety anymore. I also see that there isn't a KM number cited, either. Perhaps they have conceded to the reality that you really cannot tell the difference between a coin composed of one percentage of copper/zinc over the other. Some say that there is a color tone difference. But how can you really tell? The only way might be a very sensitive, laboratory-controlled specific gravity test.

Does anyone here know what this is all about?
Edited by mlov
05/30/2016 11:40 am
Pillar of the Community
Australia
560 Posts
 Posted 05/30/2016  10:40 pm  Show Profile   Bookmark this reply Add Enlil to your friends list Get a Link to this Reply
The fact is to identify the metal would be expensive, and not worth it.
Pillar of the Community
United States
4861 Posts
 Posted 05/31/2016  12:12 am  Show Profile   Bookmark this reply Add swamperbob to your friends list Get a Link to this Reply
NGC actually owns in house a handheld XRF and it would cost them nothing more than time to be positive.

A Specific Gravity test would be possible using an analytical balance but NGC does not employ anyone who could perform such a test for less cost than simply shooting the coin with XRF.
My book on Counterfeit Portrait 8Rs is available from Amazon http://ccfgo.com/TheUnrealReales or from me directly if you want it signed.
Valued Member
United States
78 Posts
 Posted 05/31/2016  7:30 pm  Show Profile   Bookmark this reply Add mlov to your friends list Get a Link to this Reply
Good that NGC have an XRF...

So why do you think that they did not put "BRONZE" or "BRASS" on the tag?

They always have before...
Valued Member
United States
233 Posts
 Posted 05/31/2016  8:33 pm  Show Profile   Bookmark this reply Add PatAR to your friends list Get a Link to this Reply
I'm grateful for your post as I learned an interesting tidbit about those 10 won. Thanks!

I believe the reason for the missing variety may be more mundane.

NGC offers a service called Variety Plus, the description of which on their website begins: "Upon request, NGC examines coins for recognized varieties and assigns an appropriate attribution."

Because they charge extra for this service and it must be requested, the submitter may not have realized the service cost extra or may have chosen not to have the variety listed.

If the coins in your photos were submitted by you and you did not specifically request variety attribution in either case, then I would recommend contacting NGC to ask about it.

Hope this helps
Valued Member
United States
78 Posts
 Posted 06/03/2016  6:48 pm  Show Profile   Bookmark this reply Add mlov to your friends list Get a Link to this Reply
http://goccf.com/t/261955#2212242
Well, I'll be hornswaggelered...
Thanks for the info on "Variety Plus!"
That would make sense!
Valued Member
United States
78 Posts
 Posted 06/03/2016  11:19 pm  Show Profile   Bookmark this reply Add mlov to your friends list Get a Link to this Reply
Here's a 1970 brass-attributed NGC example...

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