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Discolouration Of 1983 Proof Coins

 
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Author Previous TopicReplies: 5 / Views: 207Next Topic  
Valued Member

Australia
297 Posts
 Posted 09/22/2020  6:54 pm Show Profile   Bookmark this topic Add David Graham to your friends list Get a Link to this Message
Am looking at purchasing this set of 1983 UK proof coins but am concerned about the dicolouration. I have seen this on pics of other coins (smokey looking on outside and brown in the middle). I suspect something has leached out of the surrounding material. Does this dicolouration clean off or is it permanent? Also, what rough value would you place on this set given its condition?
Thanks
Edited by David Graham
09/22/2020 7:37 pm
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United States
51189 Posts
 Posted 09/22/2020  7:23 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
My advice would be to leave these coins as they are. Efforts to improve them will most likely have the opposite effect. Some collectors like coins toned like this.
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New Zealand
1478 Posts
 Posted 09/22/2020  9:29 pm  Show Profile   Bookmark this reply Add Princetane to your friends list Get a Link to this Reply
David if I could, remove the coins from the set and place them in mylar holders or a coin cabinet, the set has an air leak obviously which is leaching air into it.

I am considering a 1984 set with the same issue, halos of tarnishing on the Cupronickel but the Bronze and brass are fine - although in your case they are not.

When you remove them, use gloves or handle by edges with clean hands and fingers - like coinfrog said, do not try to clean or dip them in any way.

Value wise, the dealers I work with say they have high cat values of like 35 or 40, but demand is quite low, as mintage numbers were high (100k+) and there is no precious metal content in these sets. A good set is worth to me around $25 NZD and an impaired one like yours - half that figure.

To be honest, you could probably get a fault free one quite cheaply like AUD $20 from a dealer desparate to offload it.

Don't worry I have a thing for BU and Proof English modern coins too - I just spent about $60 on the 1983 - 1986 UNC sets.
Loving Halfcrowns. British and Commonwealth coins 1750 - 1950 and anything Kiwi.
If it's round, shiny and silvery I will love it.
Valued Member
Australia
297 Posts
 Posted 09/22/2020  9:45 pm  Show Profile   Bookmark this reply Add David Graham to your friends list Get a Link to this Reply
Thanks Princetane and Coinfrog. Seller wants $10 plus $9 postage so all up not worth it. Would rather spend the extra $$ and get one without the tone defects.

I am still not sure this is due solely to air leaching in. There are plenty of coins older than this that have been stored in non-air tight containers that don't show this kind of discoloration. I supect it is the interaction of mositure in the air and the packing materials leaching to create an aqueous environment for reactions to take place. But that's only my humble opinion.
Valued Member
United Kingdom
470 Posts
 Posted 09/23/2020  02:29 am  Show Profile   Check PaddyB's eBay Listings Bookmark this reply Add PaddyB to your friends list Get a Link to this Reply
It is not uncommon for the early GB proof sets in these holders to discolour - I think like you that it is to do with the materials used in the construction of the package. They will not clean, so not worth trying.
In the UK these sets in great condition will sell for only 10 to 15. In that condition - maybe a 5 at best. The postage is the killer.
Pillar of the Community
United Kingdom
7615 Posts
 Posted 09/23/2020  02:45 am  Show Profile   Check NumisRob's eBay Listings Bookmark this reply Add NumisRob to your friends list Get a Link to this Reply

Quote:
It is not uncommon for the early GB proof sets in these holders to discolour - I think like you that it is to do with the materials used in the construction of the package. They will not clean, so not worth trying.

Lots of GB proof sets from this period are in similar condition. If you wanted to sell the coins, you might do better by breaking up the set and offloading the 2p. 5p and 10p separately - these were not issued for circulation, so there is always a market for them with collectors wishing to put together date runs.
Edited by NumisRob
09/23/2020 02:45 am
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