PCGS 2005-D California quarter reverse missing clad layer. The coin is copper on the reverse due to the outer nickel layer missing before the coin was struck.
California is a very scarce state for missing clad layers, and this is an affordable example, having light wear.
PCGS 2005-D Oregon state quarter with an obverse missing clad layer. The coin is missing the obverse clad layer, and so is copper on that side. AU55 Red/Brown
PCGS 2005-D Oregon quarter reverse missing clad layer. The coin is copper on the reverse side.
A scarcer state for missing clad layers, although somewhat available.
MS63 Brown
NGC 2005-P Minnesota quarter reverse missing clad layer. The coin is copper on the reverse side, because the clad layer was missing before strike.
MS64 Red/Brown
NGC 2002-P Louisiana quarter reverse missing clad layer. The coin is copper on the state side, which is the most desirable side to have missing.
A scarce state for missing clad layers...