National Postal Museum
6-cent, Air Post Envelope Working Die
Bureau of Engraving and Printing · c. 1950
6-cent working die (No. 14) depicting transport plane, used by the International Envelope Corporation for printing Air Post stamped envelopes for the Canal Zone Government; master die engraved by E. A. Ligi (plane) and Axel W. Christensen (lettering) at the Bureau of Engraving & Printing, Printing Division. C. Z. Scott UC3.
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