I have a intersting 1984 Lincoln Cent that shows wear and damage but also seems like the Die got damaged after Died and looks like die gauges and die cracks all over the coins reverse an obverse . There shows Rim Cuds by"States" and "United". Also IGWT and EPU . Check pics out.
For some coins, you have to think "how could this have happened during the minting process"? For this particular coin, I can't imagine it leaving the mint like that. PMD. Try looking at the site http://error-ref.com and check out the known mint errors so you have something to compare your coins to when searching.