That's a real old one. I have only seen those on a Hundred Series but I know the valve itself was also used on the NAAs with a different plate.
Looking it over I'm not so sure.
Here are a couple of photos. One of a standard remote for a Hundred/Thousand.
Second photo is of the mount on the top cover on an NAA.
What makes me wonder is the three bolt holes - both in your second photo and my second photo.
The Hundreds all had 4 bolts.
I really am not at all familiar with the NAAs.
Maybe someone here can help.