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I keep reading the same sentence, between "no watermarked" "no watermark" or "not watermarked" I cant see the difference.
Either don't put 'ed' at the end of word 'watermark 'if you use the word no.
Or put a 't' on the end of 'no' if you use watermark with 'ed' at the end.
The difference in meaning:
'No watermark' means a watermark does not exist on the stamp. (A thing)
'Not watermarked' means the act of putting a watermark on a stamp has not happened. (An action).
'No watermarked' is incorrect English.
However I commend you on making such a great effort in a second language. English is unfortunately not an easy language to master.