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Replies: 31 / Views: 5,116 |
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Valued Member
United States
485 Posts |
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Pillar of the Community
United States
4692 Posts |
Air pollution at the mint.
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Bedrock of the Community
13014 Posts |
The packaging. Most US mint packaging is destructive to the coins.
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Moderator
 United States
56855 Posts |
The mint holder and poor storing environment. The cent has a premium because of the toning,more than a little common. Check the bay for sold values. John1 
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Pillar of the Community
 United States
8939 Posts |
I kind of like the toning on the Cent
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Moderator
 United States
189763 Posts |
Quote: Air pollution at the mint. No.  Quote: The mint holder and poor storing environment. Correct. The lens is not truly sealed, that is, it is not air tight. The environment where the set is stored can affect the coins.
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New Member
United States
6 Posts |
That is called target toning. I have found it to be mostly on the 70S proof sets. But, I imagine that it can be found on other years also. Some of it can look real hazy and not attractive. Yet I have seen some that really pop and have great eye appeal. Like the Cent in your set.
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Pillar of the Community
United States
987 Posts |
The cent obverse is great, but some of the reverses look nice as well imo.
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Pillar of the Community
 United States
6514 Posts |
I like the toning. Nice LMC.
Check out my counterstamped Lincoln Cent collection: http://goccf.com/t/303507
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Rest in Peace
United States
18456 Posts |
This toned proof Lincoln is odd indeed .I'm sure there is a collector out there that would pay dearly for it . 
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Moderator
 United States
56855 Posts |
It is a well know type of coin. John1 
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Valued Member
United States
93 Posts |
A mix of whatever chemicals were in that holder, humidity and, heat.
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Bedrock of the Community
United States
19969 Posts |
The 1970 sets are well known for causing toning. I'd like the see the reverse of that Lincoln, it's a BEAUTY!
Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Bedrock of the Community
Canada
24885 Posts |
Very nice toning on the LMC!
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Pillar of the Community
United States
7635 Posts |
Poor packinging and poor storage conditions mostly. Humidity and temperature swings off the charts don't help either.. These are just some of the reasons these sets tone the way the do.
Sometimes it enhances the value. Most of the time it doesn't.
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Bedrock of the Community
United States
11951 Posts |
If it was just the holder .. All the 1970 sets would be that way.
I would put it mostly on the Humidity and temputure.
And as Jbuck posted .. the holder is not sealed.
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Replies: 31 / Views: 5,116 |