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Bad Die Polishing?

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ikandiggit's Avatar
Canada
1166 Posts
 Posted 02/19/2009  4:58 pm Show Profile   Bookmark this topic Add ikandiggit to your friends list Get a Link to this Message Number of Subscribers
Found this 1988(P) Rosie dime today and the background is pretty interesting. Looks like a silver Aurora Borealis. I'm guessing it's a poorly polished die. Any idea's?

(Pics are with my new Sony DSC-H50 camera.)
Bad-Die-Polishing?

Bad-Die-Polishing?

Bad-Die-Polishing?
Bedrock of the Community
biokemist6's Avatar
United States
12437 Posts
 Posted 02/19/2009  6:02 pm  Show Profile   Bookmark this reply Add biokemist6 to your friends list Get a Link to this Reply
Notice how it all radiates outward to the rims? Those are very heavy flow lines from die erosion. When a planchet is struck into a coin, the planchet itself is smaller in diameter and thicker than the resulting coin. The compression from the dies creates what is known as cold flow- it causes the metal to take the form of the dies through pressure only and without heat(melting). Flow lines are what helps create luster on a coin and those flow lines are the first thing to wear when a coin is circulated, hence you lose luster. The cold flow process wears the dies and they start as microscopic lines but given enough time and coin strikes, they develop into this coin.
Edited by biokemist6
02/19/2009 7:43 pm
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ikandiggit's Avatar
Canada
1166 Posts
 Posted 02/19/2009  6:24 pm  Show Profile   Bookmark this reply Add ikandiggit to your friends list Get a Link to this Reply
Wow! That is great information, thanks! This is why I love this hobby. It's not just amassing coins, there can be so many more dimensions to it.
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Chump_Change's Avatar
United States
618 Posts
 Posted 02/19/2009  6:29 pm  Show Profile   Bookmark this reply Add Chump_Change to your friends list Get a Link to this Reply
Awesome info. Thanks for sharing that with us.
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