
Judging current picks Id say carbon spots that normally don't go away.
Try an acetone soak though, but don't get your hopes up. If organic, grease or dirt will help remove. If carbon spot(s) or corrosion will not improve it.
If sure it's zincoln date from 1982 - 1992. Close up reverse could narrow it down maybe. That said a close up of the obverse may show something though or under the spot. Thanks, Doug.
Edited by Halo1st
06/23/2015 11:53 am