Dutch webbing mapcase, British WW2 model

Never saw one of these before, can take detailpics of it later, just wanted to show it exists.
The build is the same as the British WW2 type with the wooden board, and the only marking I found yet is an NSN number.

What numbers are in the NSN?

Took some more pics, the country code in the NSN is 17.





I'm having some trouble with posting photos though, the first time they didn't show up, so I edited them in again, but now they are very small.

It seems when I use the "insert all" button they don't show up at all

Well the 17 is proof of Dutch use for sure. I have never seen one before, not even in photographs.

I have some others that I believe are Belgian post-war issue.