Laurentius, I checked my own records, the Ritterkreuz is awarded to 19 Dutch recipients. Furthermore I found 4 Dutch recipients of the Ritterkreuz with Crown, 5 Honor crosses, 1 Grand Commander and 8 Grand Crosses. I am sure I missed a few.
I have in my collection a set of three awarded to a Dutch officer identified to Colonel Clavareau.
Regards
Herman