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On a small plate marked with "800", I found the marks "N under Crown", "Bird runnig left" and "Flower/Shamrock". Could this be a unknown Hanau Pseudo Mark? All ideas are welcome! Thanks!

Hi,
Unattributed Hanau - see here:
https://www.925-1000.com/Fgerman_hanau_marks_01.html

Middle column, second set of marks from top.
Regards

Yes, wounderfull! Thank you very much!
I checked this marks but looking on them and see the significant details is a great difference.
Did you also saw the very bad position of the - in my opinion machine made - embossing? Very sloppy work.
Regards

Hanau silversmiths were not very consistent with their marks, full sets of marks are seldom seen, so only one identical mark is enough for positive identification.
Right, it was machine made and most likely mass produced.
Regards