five trial color proofs including red on yellow, blue on yellow (corner fault), red on blue, blue on red (oxidized), and red on red (crayon cancel also seen on 20L29), all of which are present in an April 1877 presentation set of nine trial color proofs (ex-Dos Passos and Golden), additionally a blue on blue example with what may be faked "Paid" in circle cancels, despite small faults a very fine and rare group