A sheet element, such as a banknote, a document with intrinsic value and the like, with security element, which comprises a sheet-like element (2) that incorporates a security element (3), preferably in the form of a strip. Windows (4) are formed in the sheet-like element (2) at the security element (3). The particularity of the invention consists in that the number of windows (4) is correlated to the face value of the sheet element.
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