Stamps › US › Smithsonian National Postal Museum — Bureau Plate Proofs › 50c Joseph Clay Styles Blackburn plate proof
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StampSource · si-npm
50c Joseph Clay Styles Blackburn plate proof
Smithsonian National Postal Museum — Bureau Plate Proofs · US · English · 1930
Catalog record
| Line | US |
|---|---|
| Set / series | Smithsonian National Postal Museum — Bureau Plate Proofs |
| Language | English |
| Year | 1930 |
| Date | October 25, 1930 |
| Kind | stamp |
| Place | United States of America |
| Scott | Canal Zone 114 |
| Medium | paper; ink (rose lilac) / engraving |
| Region | us |
| Npm record | npm_0.309126.322 |
| Description | 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. |
| Oracle ID | 36592825 |
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Source credit: Smithsonian National Postal Museum