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?
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.
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