PCGS 2006-P Colorado quarter with the reverse clad layer missing. The coin is copper on its reverse, because the clad layer was missing before the coin was struck. Missing clad layers are most...
PCGS 2000-P Massachusetts quarter missing clad layer reverse. The coin is copper on the reverse side due to the clad layer missing before strike. MS64 Red/Brown
NGC 2002-D Mississippi state quarter reverse missing clad layer. The coin is missing the clad layer on the reverse side, and so is copper on the reverse side.
MS65 Red/Brown