Sometimes you can tell the date of a Lincoln Cent just from the engraving details. They've had to re-engrave the master dies as they wear out over the years.
FYI--few diseases would live long on pennies, since copper is a pretty effective anti-microbal agent. For this reason, our currency uses ink with a high copper content. Then again, Anthrax spores might live on a penny for a long time....
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