Stamps › US › Smithsonian National Postal Museum — Bureau Plate Proofs › $1 Pan American Clipper Landing plate proof
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StampSource · si-npm
$1 Pan American Clipper Landing plate proof
Smithsonian National Postal Museum — Bureau Plate Proofs · US · English · 1939
Catalog record
| Line | US |
|---|---|
| Set / series | Smithsonian National Postal Museum — Bureau Plate Proofs |
| Language | English |
| Year | 1939 |
| Date | April 25, 1939 |
| Kind | stamp |
| Place | United States of America |
| Scott | Canal Zone C20 |
| Medium | paper; ink (green) / engraving |
| Region | us |
| Npm record | npm_0.309126.300 |
| 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 | 36594585 |
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Source credit: Smithsonian National Postal Museum