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The stamp was produced and issued to honor the world's first communications satellite. [4] Designed by Ervine Metzl, the stamp was printed by the rotary process, electric-eye perforated, and issued in panes of fifty stamps each. Quantities issued totaled more than 120 million.
Many artists have had the same work appear on different U.S. postages stamps and many artists have had multiple works appear on U.S. postage stamps. The list does not include artists who were commissioned by the U.S. Post Office Department (or its successor, the United States Postal Service) to specifically create artwork for a postage stamp.
Stamp paper watermarks also show various designs, letters, numbers and pictorial elements. The process of bringing out the stamp watermark is fairly simple. Sometimes a watermark in stamp paper can be seen just by looking at the unprinted back side of a stamp. More often, the collector must use a few basic items to get a good look at the watermark.
Secret marks are small design alterations added to distinguish printings unambiguously. These usually take the form of small lines or marks added to clear areas of a design. Chinese stamps of the 1940s have secret marks in the form of slightly altered characters, where two arms might be changed to touch, when previously they were separate.
Eyes only is jargon used with regard to classified information.Whereas a classified document is normally intended to be available to readers with the appropriate security clearance and a need to know, an "eyes only" designation, whether official or informal, indicates that the document is intended only for a specific set of readers.
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Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps, and identity cards.