German notgeld watermarks

Hi
I have read somewhere, that there are estimated 160.000 different German notgeld notes. Many of them have watermarks and even more, different notes have same watermarks. From this point, I guess it would be prudent to set up pictures of watermarks in the same way as are pictures of mintmarks. With such approach, there would be lesser need for disc space, as pictures would be selected from a fixed list (at least for german notgeld). This would be a partial solution, I hope it can be added one day.
I believe there are some 50-60 different watermarks, could be more. This would also allow to differentiate more exactly differences between notes, as some same denominations have been printed with and without watermark.
LP

If needed...
http://www.milliondollarbabies.com/Images/Watermarks/DisplayWmk1.htm