Winchester security paper

Winchester security paper is a patterned underprint paper, typically used for bank checks. It exists in various colors. It is made to show tampering with writing and signatures; in stamps, to show attempts at removing cancels. A version was used by Venezuela in the 1930s for its definitives and airmails.  File:Venezuela Win paper.jpg|The paper's strong colors often overwhelmed the printing, making it hard to read the values. 

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