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фоновая печать (An underprint is anything printed underneath the main design of a stamp, banknote or similar item. Underprinting is used as a security measure to prevent forgery, or the cleaning of a postmark from a used stamp. The most common form of underprinting is burelage which takes the form of a faint pattern of lines or dots.  wikipedia.org Leonid Dzhepko) | |||
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