Thank you Milmed,
This link leads to a page with an interesting PDF.
https://www.ajol.info//index.php/sms...cle/view/89557
There were 4 Dutch army observers, all officers.
The article does not mention Dutch military staff supporting these officers.
The button looks very much an Other Ranks button.
Do you know if Dutch send relief goods after the end of the war, e.g. clothing?