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  2. Watermark - Wikipedia

    en.wikipedia.org/wiki/Watermark

    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.

  3. Errors, freaks, and oddities - Wikipedia

    en.wikipedia.org/wiki/Errors,_freaks,_and_oddities

    Invert error: Part of the stamp is printed upside-down. Inverted overprint: The overprint on the stamp is printed upside-down. Color error: Stamp is printed in the wrong color(s). Paper error: Stamp is printed on the wrong type of paper which, e.g., may have a different watermark or color than intended.

  4. Washington–Franklin Issues - Wikipedia

    en.wikipedia.org/wiki/Washington–Franklin_Issues

    The actual watermark portion of the paper is thinner than the surrounding paper. The difference in paper thickness can usually be detected by holding the stamp up to a light, however some countries have issued stamps whose watermarks are very difficult to detect in this manner and require watermark detection fluid.

  5. Postage stamp paper - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp_paper

    Normal – When the watermark coincides with the design of the stamp when viewed from the front of the stamp. The watermark will be mirrored when viewed from the back of the stamp. Inverted – When the watermark is upside down when viewed from the front of the stamp. That is, when the stamp's printed design is right side up and the watermark ...

  6. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    A PDF creator and virtual PDF printer for Microsoft Windows PDF-XChange: Proprietary: Yes: PDF Tools allows creation of PDFs from many types of source input (images, scans, etc.). The PDF-XChange print driver allows printing directly to a PDF. A "lite" version of the print driver is free for non-commercial (home and academic) use. PrimoPDF ...

  7. Security printing - Wikipedia

    en.wikipedia.org/wiki/Security_printing

    True watermark. A true watermark is a recognizable image or pattern in paper that appears lighter or darker than surrounding paper when viewed with a light from behind the paper, due to paper density variations. A watermark is made by impressing a water coated metal stamp or dandy roll onto the paper during manufacturing.

  8. Invert error - Wikipedia

    en.wikipedia.org/wiki/Invert_error

    It is possible for a single-color stamp to be inverted relative to watermark, but this is called an "inverted watermark" rather than an "inverted stamp". Depending on the positioning of stamps within their sheet, the invert may be perfectly centered (as with the Inverted Jenny), or offset. Inverted overprint on a 1919 stamp of Siberia

  9. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Nevertheless, many Americans took up using stamps; about 3,700,000 of the 5¢ and about 865,000 of the 10¢ were sold, and enough of those have survived to ensure a ready supply for collectors, although the demand is such that a very fine 5¢ sells for around $500 as of 2020, and the 10¢ in very fine condition, face-free stamped cancellation ...

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