@LilianaElena
This post is part of the book Beginner’s Guide To Collect Paper Money, check it out at Banknote Heaven.
A watermark is put onto a banknote's paper prior to the printing process as a security device. Watermarks look as a blank spot on a bill. You can see a watermark holding up the banknote to the light.
The note below has the Tutankhamen’s mask as a watermark at right.
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