Watermarks & Custom Watermarks
https://www.thepapermillstore.com/custom-watermark-paper
What is custom watermark paper?
Custom Watermark Paper. When it comes to stationery, nothing is more sophisticated than a watermark. A watermark communicates a sense of style and adds a layer of security to a document – pressed directly into the fibers and designed to be completely unique, it cannot be removed.
https://www.bing.com/search?q=stationery+watermark&form=ANNTH1&refig=21917a51d7f14e92b66770e3b6e8387d&sp=-1&pq=stationery+watermar&sc=4-19&qs=n&sk=&cvid=21917a51d7f14e92b66770e3b6e8387d