Official Seal, 1877, original pen-and-ink drawing on thick brown paper. Preliminary sketch referred to in two letters from the National Bank Note Company, Very Fine and unique, ex-Earl of Crawford, Christiansen, Chesapeake. Scott No. OX1-E1  Estimate $4,000 - 5,000. The following is content from the National Bank Note Company letters that refer to the drawing: 10 February 1877, "Your favor of instructions came to hand this morning with draft of the Official Seal for use of the Dead Letter Office. Before engraving, we will make a drawing which will give you a fair idea of the design", and 19 February 1877, "Wherein we hand you model for dead letter stamp which we trust will please you". $0 (Image)