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John's 1989 cent currently appears in the latest edition of Coin World. Unfortunately, the reproduced image is too small to properly show the array of fine cracks. Image size is up to the editor -- I have no input.
Thank you for letting us know Mike!! Congratulations John!! That is so cool!!!
Or if someone dipped the cent in LN2 or something like that.
Hmmmm ...... I wonder if you are right about liquid nitrogen.
Copper and zinc expanding at different rates and also being affected by different thickness at the devices.
Be verwy verwy quiet... I'm hunting coins!!! Good Hunting!!!
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