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1981 United States Proof Set Error ?

 
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United States
3 Posts
 Posted 08/13/2022  02:59 am Show Profile   Bookmark this topic Add Hammer420 to your friends list Get a Link to this Message
This 1981 proof set has an ugly penny inside a sealed plastic display. The coins are all "s" type 1 and besides the penny look to be in good shape. Anyone know why this penny looks like there was an error plating it ? It was my understanding that before 1982 pennies were 95% copper and therefore not plated.

The proof set has been in a safety deposit box for the last 40 years. I didn't pay much attention to weather the penny looked like that when it was put in the safety deposit box and haven't looked at in 40 years until today. So your opinion is greatly appreciated. TY




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United States
3638 Posts
 Posted 08/13/2022  03:34 am  Show Profile   Bookmark this reply Add Yokozuna to your friends list Get a Link to this Reply
to the CCF!

You are correct that this coin is not plated. It's a bronze alloy of 95% copper with some tin and zinc. All of the coins have an "S" mint mark showing that they were struck in San Francisco.

It looks like someone contaminated the coin by touching it or letting something else come into contact with it. This could have happened at the mint after the coin was struck, or when the coin was placed into the hard plastic holder. The area has toned to a darker brown color. This happens to most copper cents that are circulated, but this coin received a single swipe across it the reverse causing the darker stripe.

ANA ID: 3203813 - CONECA ID: N-5637

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United States
6553 Posts
 Posted 08/13/2022  04:20 am  Show Profile   Bookmark this reply Add westernsky to your friends list Get a Link to this Reply
I'd guess the coin was contaminated when it went into the packaging some 40+ years ago. Most likely it was miss-handled and breathed on or drooled on. Most everything was packaged by hand back then.

Over time the contamination caused the copper to oxidize. It just goes with the territory. Though no longer "perfect", the coin still is very presentable. Do not try to clean it off.

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United States
3402 Posts
 Posted 08/13/2022  08:28 am  Show Profile   Bookmark this reply Add Kopper Ken to your friends list Get a Link to this Reply
...some form of contamination...



KK
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United States
398 Posts
 Posted 08/13/2022  11:41 pm  Show Profile   Bookmark this reply Add JTCC to your friends list Get a Link to this Reply
I agree, contaminated.
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