Watermark on documents

[Saruman]

Does anyone know about watermarks on old documents? Could a paper mill release paper with a year watermarked on it, prior to that actual year?

For example, could someone who died in 1862 have written something on paper that was watermarked 1863 or is that impossible?

Thanks!

 

[Saruman]

Anyone?

Did 19th century papermills release watermarked paper in advance of the actual year?