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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins

1956 Denver Error Pictures

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hemisboats
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United States
461 Posts
 Posted 12/28/2009  5:13 pm Show Profile   Bookmark this topic Add hemisboats to your friends list Get a Link to this Message Number of Subscribers
These are a few 1956 Denver Lincoln pennies that have silver blotches showing from a poor metallurgy in the raw materials. These pennies have never been touched by human hands and have never been cleaned. They were removed from the original mint rolls by me. I am looking for any input I can get. It almost seems like they were experimental copper coated or the chunks of zinc were not completely melted into the copper vats with the raw material was made into planchet's.

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures

1956-Denver-Error-Pictures
biokemist6
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United States
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 Posted 12/28/2009  9:49 pm  Show Profile   Bookmark this reply Add biokemist6 to your friends list Get a Link to this Reply

Quote:
chunks of zinc were not completely melted into the copper vats

I do not see how that would be possible since the melting point of copper(1984F) is considerably higher than that of tin(450F) or zinc(787F). The ones I have seen like that have the appearance of toning spots.
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coppercoins
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7629 Posts
 Posted 12/29/2009  06:51 am  Show Profile   Bookmark this reply Add coppercoins to your friends list Get a Link to this Reply
That's exactly what it is - toning. This happens depending on what the coins were stored in and the conditions in which they were stored. No biggie.
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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins



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