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Stamps › US › Smithsonian National Postal Museum — Bureau Plate Proofs › For Testing Purposes Only experimental plate proof
For Testing Purposes Only experimental plate proof

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For Testing Purposes Only experimental plate proof

Smithsonian National Postal Museum — Bureau Plate Proofs · US · English · 1961

Catalog record

LineUS
Set / seriesSmithsonian National Postal Museum — Bureau Plate Proofs
LanguageEnglish
Year1961
DateDecember 13, 1961
Kindstamp
PlaceUnited States of America
Mediumpaper; ink () / engraving
Regionus
Npm recordnpm_0.309126.1321
DescriptionCertified 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.
Oracle ID36597427

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Source credit: Smithsonian National Postal Museum