Lincoln Proof Cent Error? What Is This?

Rob41281

not the clearest picture but can anyone explain what that line is off of lincolns head and under the t in trust?

FredWeinberg

You didn't mention the date, but I'd guess it's a
post 1982 Copper-Plated Zinc Planchet............

Based on the scan, it's probably a small defective
copper-plating area on the surface, which tends
to show as either a round, or elongated "bubble"
on the surface of the coin.

Very common on BU's, scarcer but not rare on Proofs....

Hope this helps.....

Rob41281

its dated 1987