Post Office Seal, 1877, red orange, trial color die proof on India. Die sunk on 102x72mm card, engraved die number "4585" above design, fresh and Very Fine, ex-Christiansen, Chesapeake. Scott No. OX1TC1  Estimate $1,000 - 1,500. A single set of seven trial color proofs in different colors were sent to the post office on March 6, 1877 to assist in color selection for the 1877 seal. $0 (Image)