The coin is extremely thin. On the reverse, there are parallel horizontal striations that give it almost a machined appearance. The edge has these too. Very slight traces on the front. Lettering is weak except ONE CENT and LIBERTY are very strong. The wreath and bust are also pretty strong. I'm surprised that 30% of the coin could be etched away leaving that much detail. That would explain the striations. They'd be the grain structure of the planchet.