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5c American Authors Louisa May Alcott die proof attached to plate proof, 14598. Certified plate proofs are the last printed proof of the plate before printing the stamps at the Bureau of Engraving
3c Pan American Union die proof attached to plate proof, 14682. Certified plate proofs are the last printed proof of the plate before printing the stamps at the Bureau of Engraving and Printing
4 1 / 2c White House approved large die proof, 14072. Creator4 1/2c White House approved large die proof, 14072. 4 1/2-cent White House Large Die Proof, originally attached by staples to certified plate proof 21972 as a reference copy for the Bureau of
The Two Penny Blue or The Two Pence Blue postage stamp, 1840sThe Two Penny Blue or The Two Pence Blue was the world?s second official postage stamp, issued after the Penny Black. It was issued in the United Kingdom
