National Postal Museum
3c American Authors Ralph Waldo Emerson die proof attached to plate proof
Bureau of Engraving and Printing · January 2, 1940
Certified plate proofs are the last printed proof of the plate before printing the stamps at the Bureau of Engraving and Printing. These plate proofs are each unique, with the approval signatures and date. For postal scholars these plates provide important production information in the plate margin inscriptions, including guidelines, plate numbers, and initials of the siderographer, or person who created the plate from a transfer roll.
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